wallet - How to migrate bitcoin node from one computer to ...

Moving wallet to another computer, can I copy the "blocks" folder (from ~appdata\bitcoin) to avoid syncing the blockchain again?

Title pretty much says it all. Wallet is synced and on one computer... I want to reinstall windoze on it so it's actually not moving to a different computer but I assume it's just the same. So obviously I'm copying the wallet.dat backup... But I was wondering if I could also keep the 15.7Gb blockchain to avoid downloading it again? When I restore it afterwards, can I just drop the wallet.dat and blocks folder in the appdata\bitcoin?
Or is there more to it than that?
submitted by the_bolshevik to BitcoinWallet [link] [comments]

Technical: Taproot: Why Activate?

This is a follow-up on https://old.reddit.com/Bitcoin/comments/hqzp14/technical_the_path_to_taproot_activation/
Taproot! Everybody wants it!! But... you might ask yourself: sure, everybody else wants it, but why would I, sovereign Bitcoin HODLer, want it? Surely I can be better than everybody else because I swapped XXX fiat for Bitcoin unlike all those nocoiners?
And it is important for you to know the reasons why you, o sovereign Bitcoiner, would want Taproot activated. After all, your nodes (or the nodes your wallets use, which if you are SPV, you hopefully can pester to your wallet vendoimplementor about) need to be upgraded in order for Taproot activation to actually succeed instead of becoming a hot sticky mess.
First, let's consider some principles of Bitcoin.
I'm sure most of us here would agree that the above are very important principles of Bitcoin and that these are principles we would not be willing to remove. If anything, we would want those principles strengthened (especially the last one, financial privacy, which current Bitcoin is only sporadically strong with: you can get privacy, it just requires effort to do so).
So, how does Taproot affect those principles?

Taproot and Your /Coins

Most HODLers probably HODL their coins in singlesig addresses. Sadly, switching to Taproot would do very little for you (it gives a mild discount at spend time, at the cost of a mild increase in fee at receive time (paid by whoever sends to you, so if it's a self-send from a P2PKH or bech32 address, you pay for this); mostly a wash).
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash, so the Taproot output spends 12 bytes more; spending from a P2WPKH requires revealing a 32-byte public key later, which is not needed with Taproot, and Taproot signatures are about 9 bytes smaller than P2WPKH signatures, but the 32 bytes plus 9 bytes is divided by 4 because of the witness discount, so it saves about 11 bytes; mostly a wash, it increases blockweight by about 1 virtual byte, 4 weight for each Taproot-output-input, compared to P2WPKH-output-input).
However, as your HODLings grow in value, you might start wondering if multisignature k-of-n setups might be better for the security of your savings. And it is in multisignature that Taproot starts to give benefits!
Taproot switches to using Schnorr signing scheme. Schnorr makes key aggregation -- constructing a single public key from multiple public keys -- almost as trivial as adding numbers together. "Almost" because it involves some fairly advanced math instead of simple boring number adding, but hey when was the last time you added up your grocery list prices by hand huh?
With current P2SH and P2WSH multisignature schemes, if you have a 2-of-3 setup, then to spend, you need to provide two different signatures from two different public keys. With Taproot, you can create, using special moon math, a single public key that represents your 2-of-3 setup. Then you just put two of your devices together, have them communicate to each other (this can be done airgapped, in theory, by sending QR codes: the software to do this is not even being built yet, but that's because Taproot hasn't activated yet!), and they will make a single signature to authorize any spend from your 2-of-3 address. That's 73 witness bytes -- 18.25 virtual bytes -- of signatures you save!
And if you decide that your current setup with 1-of-1 P2PKH / P2WPKH addresses is just fine as-is: well, that's the whole point of a softfork: backwards-compatibility; you can receive from Taproot users just fine, and once your wallet is updated for Taproot-sending support, you can send to Taproot users just fine as well!
(P2WPKH and P2WSH -- SegWit v0 -- addresses start with bc1q; Taproot -- SegWit v1 --- addresses start with bc1p, in case you wanted to know the difference; in bech32 q is 0, p is 1)
Now how about HODLers who keep all, or some, of their coins on custodial services? Well, any custodial service worth its salt would be doing at least 2-of-3, or probably something even bigger, like 11-of-15. So your custodial service, if it switched to using Taproot internally, could save a lot more (imagine an 11-of-15 getting reduced from 11 signatures to just 1!), which --- we can only hope! --- should translate to lower fees and better customer service from your custodial service!
So I think we can say, very accurately, that the Bitcoin principle --- that YOU are in control of your money --- can only be helped by Taproot (if you are doing multisignature), and, because P2PKH and P2WPKH remain validly-usable addresses in a Taproot future, will not be harmed by Taproot. Its benefit to this principle might be small (it mostly only benefits multisignature users) but since it has no drawbacks with this (i.e. singlesig users can continue to use P2WPKH and P2PKH still) this is still a nice, tidy win!
(even singlesig users get a minor benefit, in that multisig users will now reduce their blockchain space footprint, so that fees can be kept low for everybody; so for example even if you have your single set of private keys engraved on titanium plates sealed in an airtight box stored in a safe buried in a desert protected by angry nomads riding giant sandworms because you're the frickin' Kwisatz Haderach, you still gain some benefit from Taproot)
And here's the important part: if P2PKH/P2WPKH is working perfectly fine with you and you decide to never use Taproot yourself, Taproot will not affect you detrimentally. First do no harm!

Taproot and Your Contracts

No one is an island, no one lives alone. Give and you shall receive. You know: by trading with other people, you can gain expertise in some obscure little necessity of the world (and greatly increase your productivity in that little field), and then trade the products of your expertise for necessities other people have created, all of you thereby gaining gains from trade.
So, contracts, which are basically enforceable agreements that facilitate trading with people who you do not personally know and therefore might not trust.
Let's start with a simple example. You want to buy some gewgaws from somebody. But you don't know them personally. The seller wants the money, you want their gewgaws, but because of the lack of trust (you don't know them!! what if they're scammers??) neither of you can benefit from gains from trade.
However, suppose both of you know of some entity that both of you trust. That entity can act as a trusted escrow. The entity provides you security: this enables the trade, allowing both of you to get gains from trade.
In Bitcoin-land, this can be implemented as a 2-of-3 multisignature. The three signatories in the multisgnature would be you, the gewgaw seller, and the escrow. You put the payment for the gewgaws into this 2-of-3 multisignature address.
Now, suppose it turns out neither of you are scammers (whaaaat!). You receive the gewgaws just fine and you're willing to pay up for them. Then you and the gewgaw seller just sign a transaction --- you and the gewgaw seller are 2, sufficient to trigger the 2-of-3 --- that spends from the 2-of-3 address to a singlesig the gewgaw seller wants (or whatever address the gewgaw seller wants).
But suppose some problem arises. The seller gave you gawgews instead of gewgaws. Or you decided to keep the gewgaws but not sign the transaction to release the funds to the seller. In either case, the escrow is notified, and if it can sign with you to refund the funds back to you (if the seller was a scammer) or it can sign with the seller to forward the funds to the seller (if you were a scammer).
Taproot helps with this: like mentioned above, it allows multisignature setups to produce only one signature, reducing blockchain space usage, and thus making contracts --- which require multiple people, by definition, you don't make contracts with yourself --- is made cheaper (which we hope enables more of these setups to happen for more gains from trade for everyone, also, moon and lambos).
(technology-wise, it's easier to make an n-of-n than a k-of-n, making a k-of-n would require a complex setup involving a long ritual with many communication rounds between the n participants, but an n-of-n can be done trivially with some moon math. You can, however, make what is effectively a 2-of-3 by using a three-branch SCRIPT: either 2-of-2 of you and seller, OR 2-of-2 of you and escrow, OR 2-of-2 of escrow and seller. Fortunately, Taproot adds a facility to embed a SCRIPT inside a public key, so you can have a 2-of-2 Taprooted address (between you and seller) with a SCRIPT branch that can instead be spent with 2-of-2 (you + escrow) OR 2-of-2 (seller + escrow), which implements the three-branched SCRIPT above. If neither of you are scammers (hopefully the common case) then you both sign using your keys and never have to contact the escrow, since you are just using the escrow public key without coordinating with them (because n-of-n is trivial but k-of-n requires setup with communication rounds), so in the "best case" where both of you are honest traders, you also get a privacy boost, in that the escrow never learns you have been trading on gewgaws, I mean ewww, gawgews are much better than gewgaws and therefore I now judge you for being a gewgaw enthusiast, you filthy gewgawer).

Taproot and Your Contracts, Part 2: Cryptographic Boogaloo

Now suppose you want to buy some data instead of things. For example, maybe you have some closed-source software in trial mode installed, and want to pay the developer for the full version. You want to pay for an activation code.
This can be done, today, by using an HTLC. The developer tells you the hash of the activation code. You pay to an HTLC, paying out to the developer if it reveals the preimage (the activation code), or refunding the money back to you after a pre-agreed timeout. If the developer claims the funds, it has to reveal the preimage, which is the activation code, and you can now activate your software. If the developer does not claim the funds by the timeout, you get refunded.
And you can do that, with HTLCs, today.
Of course, HTLCs do have problems:
Fortunately, with Schnorr (which is enabled by Taproot), we can now use the Scriptless Script constuction by Andrew Poelstra. This Scriptless Script allows a new construction, the PTLC or Pointlocked Timelocked Contract. Instead of hashes and preimages, just replace "hash" with "point" and "preimage" with "scalar".
Or as you might know them: "point" is really "public key" and "scalar" is really a "private key". What a PTLC does is that, given a particular public key, the pointlocked branch can be spent only if the spender reveals the private key of the given public key to you.
Another nice thing with PTLCs is that they are deniable. What appears onchain is just a single 2-of-2 signature between you and the developemanufacturer. It's like a magic trick. This signature has no special watermarks, it's a perfectly normal signature (the pledge). However, from this signature, plus some datta given to you by the developemanufacturer (known as the adaptor signature) you can derive the private key of a particular public key you both agree on (the turn). Anyone scraping the blockchain will just see signatures that look just like every other signature, and as long as nobody manages to hack you and get a copy of the adaptor signature or the private key, they cannot get the private key behind the public key (point) that the pointlocked branch needs (the prestige).
(Just to be clear, the public key you are getting the private key from, is distinct from the public key that the developemanufacturer will use for its funds. The activation key is different from the developer's onchain Bitcoin key, and it is the activation key whose private key you will be learning, not the developer's/manufacturer's onchain Bitcoin key).
So:
Taproot lets PTLCs exist onchain because they enable Schnorr, which is a requirement of PTLCs / Scriptless Script.
(technology-wise, take note that Scriptless Script works only for the "pointlocked" branch of the contract; you need normal Script, or a pre-signed nLockTimed transaction, for the "timelocked" branch. Since Taproot can embed a script, you can have the Taproot pubkey be a 2-of-2 to implement the Scriptless Script "pointlocked" branch, then have a hidden script that lets you recover the funds with an OP_CHECKLOCKTIMEVERIFY after the timeout if the seller does not claim the funds.)

Quantum Quibbles!

Now if you were really paying attention, you might have noticed this parenthetical:
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash...)
So wait, Taproot uses raw 32-byte public keys, and not public key hashes? Isn't that more quantum-vulnerable??
Well, in theory yes. In practice, they probably are not.
It's not that hashes can be broken by quantum computes --- they're still not. Instead, you have to look at how you spend from a P2WPKH/P2PKH pay-to-public-key-hash.
When you spend from a P2PKH / P2WPKH, you have to reveal the public key. Then Bitcoin hashes it and checks if this matches with the public-key-hash, and only then actually validates the signature for that public key.
So an unconfirmed transaction, floating in the mempools of nodes globally, will show, in plain sight for everyone to see, your public key.
(public keys should be public, that's why they're called public keys, LOL)
And if quantum computers are fast enough to be of concern, then they are probably fast enough that, in the several minutes to several hours from broadcast to confirmation, they have already cracked the public key that is openly broadcast with your transaction. The owner of the quantum computer can now replace your unconfirmed transaction with one that pays the funds to itself. Even if you did not opt-in RBF, miners are still incentivized to support RBF on RBF-disabled transactions.
So the extra hash is not as significant a protection against quantum computers as you might think. Instead, the extra hash-and-compare needed is just extra validation effort.
Further, if you have ever, in the past, spent from the address, then there exists already a transaction indelibly stored on the blockchain, openly displaying the public key from which quantum computers can derive the private key. So those are still vulnerable to quantum computers.
For the most part, the cryptographers behind Taproot (and Bitcoin Core) are of the opinion that quantum computers capable of cracking Bitcoin pubkeys are unlikely to appear within a decade or two.
So:
For now, the homomorphic and linear properties of elliptic curve cryptography provide a lot of benefits --- particularly the linearity property is what enables Scriptless Script and simple multisignature (i.e. multisignatures that are just 1 signature onchain). So it might be a good idea to take advantage of them now while we are still fairly safe against quantum computers. It seems likely that quantum-safe signature schemes are nonlinear (thus losing these advantages).

Summary

I Wanna Be The Taprooter!

So, do you want to help activate Taproot? Here's what you, mister sovereign Bitcoin HODLer, can do!

But I Hate Taproot!!

That's fine!

Discussions About Taproot Activation

submitted by almkglor to Bitcoin [link] [comments]

How to sell xBricks for money (self post for mod approval)

Preface
I've written this guide with those that are unfamiliar with crypto in mind, however it's still a lengthy process. I'm going to try to present this in a way where you don't have to learn how the underlying crypto technology works, but I will add in links to relevant concepts in case you're curious. This process was a lot more complicated before but I made a web interface to simplify it.
At the time of writing this, FortniteBR BRICKs are worth 10 cents a piece. That makes 1000 bricks worth 100 bucks. The liquidity pool is about $14,000 at the time of writing, meaning that there's room in the market for you to hypothetically get $7,000 if you had a lot of BRICKs.
If at any point throughout this process you need help, DM me!
Misc. Resources That Might Be Helpful
What you need
You will need:
Step 1: Setup
On your desktop computer, install MetaMask. This is an Ethereum Wallet which will allow you to interact with the Ethereum Network and its many sidechains. More on this later.
Follow the setup instructions in MetaMask. If you've never done this before, you'll need to create a new seed phrase. Video tutorial if you get stuck.
YOUR SEED PHRASE IS THE KEY TO YOUR WALLET. ANYONE WHO HAS ACCESS TO YOUR SEED PHRASE CAN TAKE YOUR FUNDS. IF YOU LOSE YOUR SEED PHRASE YOU HAVE NO WAY TO RECOVER YOUR FUNDS. WRITE IT DOWN AND STORE IT IN A SAFE PLACE!!! NEVER GIVE IT OUT TO ANYONE - ANYONE THAT ASKS FOR YOUR SEED PHRASE IS TRYING TO SCAM YOU! DON'T FALL FOR IT!
In the MetaMask interface, you'll see "Main Ethereum Network". This process uses two networks. One of them is the Rinkeby Testnet (where the BRICK tokens are natively) and one of them is the xDAI network which is where we will bridge the tokens to in order to exchange them for Dai, a token which is pegged to the price of the dollar.
From the dropdown, select Rinkeby Testnet. If you're in the assets tab, you should see a thing that shows your ETH balance. Below this, you should see an "add token" button. Click it. Go to "Custom Token" at the top. In "token contract address," paste in the following:
0xe0d8d7b8273de14e628d2f2a4a10f719f898450a
The other fields will autofill. Hit next. You'll now see your BRICK balance (which will be 0, you haven't transferred your bricks yet) in MetaMask if you've done everything right.
You'll need Rinkeby Ether to cover transaction fees. Since we're on a testnet, the Ether is worthless which means people hand it out for free. You can get this Ether from a variety of places:
Now it's time to get your BRICKs from your Reddit vault into your MetaMask wallet.
WARNING: ALL CRYPTO TRANSACTIONS ARE IRREVERSIBLE.
Your Ethereum address shows up under Rinkeby. It should be "0x" followed by a bunch of hex characters. Click on it to copy it to your clipboard. You now need to somehow get this to your mobile device. Email it to yourself, text it to yourself, whatever.
On your Reddit mobile app home screen, click on your profile icon and then go to vault. You'll need to set this up and claim your tokens if you haven't already. Be aware that this is also technically an Ethereum wallet. Keep your seed phrase safe.
Send however many BRICKs you want to sell to your MetaMask wallet. Check to make sure the addresses are the same, but don't worry too much about making a typo or whatever. The chances that you'd make a typo that would result in a valid Ethereum address are slim, if you get a character wrong it'll just tell you it's not a real Ethereum address and prevent you from sending.
It may show an error when you try to send. This is somewhat rare but pretty normal. They often run out of testnet Ether. Come back later and try again.
If it works properly, it'll take about a minute to go through. It may take longer than that.
Once the transaction goes through, you'll see that you have an absurd amount of BRICKs in MetaMask. No, there wasn't a glitch. The people who wrote the code for BRICKs made the decimals of precision weird for some reason. It's off by a factor of 1018. This isn't a big deal.
If you see Bricks and Ether (ETH) in your MetaMask wallet, proceed to the next step. If you're having issues, feel free to DM me.
Step 2: Getting Your BRICKs from Rinkeby to xDai
There's a LOT going on under the hood for this part (deets for those interested). Previously this required manually generating contract interactions, which is kind of a pain if you're new to Ethereum. I made a UI to make this easier (it generates the transactions for you, all you have to do is sign them with your wallet). This took way longer to do than you might guess, so feel free to help a homie out at:
0x4BCcC2569DD93C7dF43431A7b70db569dedB6187
Go to my tool. Hit connect. If you're on the Rinkeby network, it should show your balance in BRICKs. Enter the amount you want to bridge (probably all of them). If neither of us have made any mistakes, it should pop up with a request to spend your BRICKs. If there's any issue with this tool, DM me. This allows the TokenBridge contract to take your BRICKs and put them on the xDai network where you can sell them. This is the part where you'll get an error if you don't have any testnet ETH. Set the gas price to 1 (the suggested price is based on the Main Ethereum Network - it's way too high). After you approve that, it'll give you another thing to accept. This is the actual transaction where it'll bridge to xDai. Again, make sure the gas price is set to 1 and confirm the transaction.
Add xDai to MetaMask
Switch to the xDai network. We're going to add another token. Again, go to "add token" > "custom token" > "token contract address". Paste in:
0x2f9ceBf5De3bc25E0643D0E66134E5bf5c48e191
If the transactions have gone through, you should see your xBricks (the name for BRICKs that have been bridged to xDai) in MetaMask. If not, wait a bit for the transactions to go through. Sometimes there are slowdowns that cause bridging to take a while. Shouldn't take too long, though. Once that's done, you're ready for the next step.
Step 3: Trading Your xBricks for xDai
Go to Honeyswap. Hit "select a token." You'll need to paste in the xBrick address again. Here it is:
0x2f9ceBf5De3bc25E0643D0E66134E5bf5c48e191
Click xBrick.
You'll need to flipflop the trade around by hitting the arrow button. xBrick should be on top. Type in the amount of xBricks you want to sell, or hit max to sell all of them. 1 xDai = $1. You'll need to hit approve first. Set gas price to 1 again. Then you can complete the trade by hitting swap. After a bit, the xDai should show up in your wallet.
Step 4: Mainnet
Everything on Mainnet costs actual money to do. It costs about 50 cents to make a transaction and it costs about 3 bucks to use an exchange like the one we just used. If you don't have mainnet Ether, you won't be able to do anything with your mainnet Dai (what xDai is called when it's bridged back to the main Ethereum network). You may be able to find someone to lend you some ETH to make these transactions with. Whatever you do, just be aware.
If you still want to bridge your xDai into Dai, go here and make sure xDai is on the left. If it's not, go in the top right and select xDai chain. Enter the amount of xDai you want to bridge to mainnet and then hit transfer. Follow the prompts. This part may take up to an hour due to recent network congestion. After it's done, if you go back to Main Ethereum Network in MetaMask you should see your Dai.
If you have a few bucks of ETH, you can use UniSwap to convert your Dai to even more ETH. Uniswap tutorial
Things you can do with ETH
submitted by Oninteressant123 to u/Oninteressant123 [link] [comments]

Scaling Reddit Community Points with Arbitrum Rollup: a piece of cake

Scaling Reddit Community Points with Arbitrum Rollup: a piece of cake
https://preview.redd.it/b80c05tnb9e51.jpg?width=2550&format=pjpg&auto=webp&s=850282c1a3962466ed44f73886dae1c8872d0f31
Submitted for consideration to The Great Reddit Scaling Bake-Off
Baked by the pastry chefs at Offchain Labs
Please send questions or comments to [[email protected] ](mailto:[email protected])
1. Overview
We're excited to submit Arbitrum Rollup for consideration to The Great Reddit Scaling Bake-Off. Arbitrum Rollup is the only Ethereum scaling solution that supports arbitrary smart contracts without compromising on Ethereum's security or adding points of centralization. For Reddit, this means that Arbitrum can not only scale the minting and transfer of Community Points, but it can foster a creative ecosystem built around Reddit Community Points enabling points to be used in a wide variety of third party applications. That's right -- you can have your cake and eat it too!
Arbitrum Rollup isn't just Ethereum-style. Its Layer 2 transactions are byte-for-byte identical to Ethereum, which means Ethereum users can continue to use their existing addresses and wallets, and Ethereum developers can continue to use their favorite toolchains and development environments out-of-the-box with Arbitrum. Coupling Arbitrum’s tooling-compatibility with its trustless asset interoperability, Reddit not only can scale but can onboard the entire Ethereum community at no cost by giving them the same experience they already know and love (well, certainly know).
To benchmark how Arbitrum can scale Reddit Community Points, we launched the Reddit contracts on an Arbitrum Rollup chain. Since Arbitrum provides full Solidity support, we didn't have to rewrite the Reddit contracts or try to mimic their functionality using an unfamiliar paradigm. Nope, none of that. We launched the Reddit contracts unmodified on Arbitrum Rollup complete with support for minting and distributing points. Like every Arbitrum Rollup chain, the chain included a bridge interface in which users can transfer Community Points or any other asset between the L1 and L2 chains. Arbitrum Rollup chains also support dynamic contract loading, which would allow third-party developers to launch custom ecosystem apps that integrate with Community Points on the very same chain that runs the Reddit contracts.
1.1 Why Ethereum
Perhaps the most exciting benefit of distributing Community Points using a blockchain is the ability to seamlessly port points to other applications and use them in a wide variety of contexts. Applications may include simple transfers such as a restaurant that allows Redditors to spend points on drinks. Or it may include complex smart contracts -- such as placing Community Points as a wager for a multiparty game or as collateral in a financial contract.
The common denominator between all of the fun uses of Reddit points is that it needs a thriving ecosystem of both users and developers, and the Ethereum blockchain is perhaps the only smart contract platform with significant adoption today. While many Layer 1 blockchains boast lower cost or higher throughput than the Ethereum blockchain, more often than not, these attributes mask the reality of little usage, weaker security, or both.
Perhaps another platform with significant usage will rise in the future. But today, Ethereum captures the mindshare of the blockchain community, and for Community Points to provide the most utility, the Ethereum blockchain is the natural choice.
1.2 Why Arbitrum
While Ethereum's ecosystem is unmatched, the reality is that fees are high and capacity is too low to support the scale of Reddit Community Points. Enter Arbitrum. Arbitrum Rollup provides all of the ecosystem benefits of Ethereum, but with orders of magnitude more capacity and at a fraction of the cost of native Ethereum smart contracts. And most of all, we don't change the experience from users. They continue to use the same wallets, addresses, languages, and tools.
Arbitrum Rollup is not the only solution that can scale payments, but it is the only developed solution that can scale both payments and arbitrary smart contracts trustlessly, which means that third party users can build highly scalable add-on apps that can be used without withdrawing money from the Rollup chain. If you believe that Reddit users will want to use their Community Points in smart contracts--and we believe they will--then it makes the most sense to choose a single scaling solution that can support the entire ecosystem, eliminating friction for users.
We view being able to run smart contracts in the same scaling solution as fundamentally critical since if there's significant demand in running smart contracts from Reddit's ecosystem, this would be a load on Ethereum and would itself require a scaling solution. Moreover, having different scaling solutions for the minting/distribution/spending of points and for third party apps would be burdensome for users as they'd have to constantly shuffle their Points back and forth.
2. Arbitrum at a glance
Arbitrum Rollup has a unique value proposition as it offers a combination of features that no other scaling solution achieves. Here we highlight its core attributes.
Decentralized. Arbitrum Rollup is as decentralized as Ethereum. Unlike some other Layer 2 scaling projects, Arbitrum Rollup doesn't have any centralized components or centralized operators who can censor users or delay transactions. Even in non-custodial systems, centralized components provide a risk as the operators are generally incentivized to increase their profit by extracting rent from users often in ways that severely degrade user experience. Even if centralized operators are altruistic, centralized components are subject to hacking, coercion, and potential liability.
Massive Scaling. Arbitrum achieves order of magnitude scaling over Ethereum's L1 smart contracts. Our software currently supports 453 transactions-per-second for basic transactions (at 1616 Ethereum gas per tx). We have a lot of room left to optimize (e.g. aggregating signatures), and over the next several months capacity will increase significantly. As described in detail below, Arbitrum can easily support and surpass Reddit's anticipated initial load, and its capacity will continue to improve as Reddit's capacity needs grow.
Low cost. The cost of running Arbitrum Rollup is quite low compared to L1 Ethereum and other scaling solutions such as those based on zero-knowledge proofs. Layer 2 fees are low, fixed, and predictable and should not be overly burdensome for Reddit to cover. Nobody needs to use special equipment or high-end machines. Arbitrum requires validators, which is a permissionless role that can be run on any reasonable on-line machine. Although anybody can act as a validator, in order to protect against a “tragedy of the commons” and make sure reputable validators are participating, we support a notion of “invited validators” that are compensated for their costs. In general, users pay (low) fees to cover the invited validators’ costs, but we imagine that Reddit may cover this cost for its users. See more on the costs and validator options below.
Ethereum Developer Experience. Not only does Arbitrum support EVM smart contracts, but the developer experience is identical to that of L1 Ethereum contracts and fully compatible with Ethereum tooling. Developers can port existing Solidity apps or write new ones using their favorite and familiar toolchains (e.g. Truffle, Buidler). There are no new languages or coding paradigms to learn.
Ethereum wallet compatibility. Just as in Ethereum, Arbitrum users need only hold keys, but do not have to store any coin history or additional data to protect or access their funds. Since Arbitrum transactions are semantically identical to Ethereum L1 transactions, existing Ethereum users can use their existing Ethereum keys with their existing wallet software such as Metamask.
Token interoperability. Users can easily transfer their ETH, ERC-20 and ERC-721 tokens between Ethereum and the Arbitrum Rollup chain. As we explain in detail below, it is possible to mint tokens in L2 that can subsequently be withdrawn and recognized by the L1 token contract.
Fast finality. Transactions complete with the same finality time as Ethereum L1 (and it's possible to get faster finality guarantees by trading away trust assumptions; see the Arbitrum Rollup whitepaper for details).
Non-custodial. Arbitrum Rollup is a non-custodial scaling solution, so users control their funds/points and neither Reddit nor anyone else can ever access or revoke points held by users.
Censorship Resistant. Since it's completely decentralized, and the Arbitrum protocol guarantees progress trustlessly, Arbitrum Rollup is just as censorship-proof as Ethereum.
Block explorer. The Arbitrum Rollup block explorer allows users to view and analyze transactions on the Rollup chain.
Limitations
Although this is a bake-off, we're not going to sugar coat anything. Arbitrum Rollup, like any Optimistic Rollup protocol, does have one limitation, and that's the delay on withdrawals.
As for the concrete length of the delay, we've done a good deal of internal modeling and have blogged about this as well. Our current modeling suggests a 3-hour delay is sufficient (but as discussed in the linked post there is a tradeoff space between the length of the challenge period and the size of the validators’ deposit).
Note that this doesn't mean that the chain is delayed for three hours. Arbitrum Rollup supports pipelining of execution, which means that validators can keep building new states even while previous ones are “in the pipeline” for confirmation. As the challenge delays expire for each update, a new state will be confirmed (read more about this here).
So activity and progress on the chain are not delayed by the challenge period. The only thing that's delayed is the consummation of withdrawals. Recall though that any single honest validator knows immediately (at the speed of L1 finality) which state updates are correct and can guarantee that they will eventually be confirmed, so once a valid withdrawal has been requested on-chain, every honest party knows that the withdrawal will definitely happen. There's a natural place here for a liquidity market in which a validator (or someone who trusts a validator) can provide withdrawal loans for a small interest fee. This is a no-risk business for them as they know which withdrawals will be confirmed (and can force their confirmation trustlessly no matter what anyone else does) but are just waiting for on-chain finality.
3. The recipe: How Arbitrum Rollup works
For a description of the technical components of Arbitrum Rollup and how they interact to create a highly scalable protocol with a developer experience that is identical to Ethereum, please refer to the following documents:
Arbitrum Rollup Whitepaper
Arbitrum academic paper (describes a previous version of Arbitrum)
4. Developer docs and APIs
For full details about how to set up and interact with an Arbitrum Rollup chain or validator, please refer to our developer docs, which can be found at https://developer.offchainlabs.com/.
Note that the Arbitrum version described on that site is older and will soon be replaced by the version we are entering in Reddit Bake-Off, which is still undergoing internal testing before public release.
5. Who are the validators?
As with any Layer 2 protocol, advancing the protocol correctly requires at least one validator (sometimes called block producers) that is honest and available. A natural question is: who are the validators?
Recall that the validator set for an Arbitrum chain is open and permissionless; anyone can start or stop validating at will. (A useful analogy is to full nodes on an L1 chain.) But we understand that even though anyone can participate, Reddit may want to guarantee that highly reputable nodes are validating their chain. Reddit may choose to validate the chain themselves and/or hire third-party validators.To this end, we have begun building a marketplace for validator-for-hire services so that dapp developers can outsource validation services to reputable nodes with high up-time. We've announced a partnership in which Chainlink nodes will provide Arbitrum validation services, and we expect to announce more partnerships shortly with other blockchain infrastructure providers.
Although there is no requirement that validators are paid, Arbitrum’s economic model tracks validators’ costs (e.g. amount of computation and storage) and can charge small fees on user transactions, using a gas-type system, to cover those costs. Alternatively, a single party such as Reddit can agree to cover the costs of invited validators.
6. Reddit Contract Support
Since Arbitrum contracts and transactions are byte-for-byte compatible with Ethereum, supporting the Reddit contracts is as simple as launching them on an Arbitrum chain.
Minting. Arbitrum Rollup supports hybrid L1/L2 tokens which can be minted in L2 and then withdrawn onto the L1. An L1 contract at address A can make a special call to the EthBridge which deploys a "buddy contract" to the same address A on an Arbitrum chain. Since it's deployed at the same address, users can know that the L2 contract is the authorized "buddy" of the L1 contract on the Arbitrum chain.
For minting, the L1 contract is a standard ERC-20 contract which mints and burns tokens when requested by the L2 contract. It is paired with an ERC-20 contract in L2 which mints tokens based on whatever programmer provided minting facility is desired and burns tokens when they are withdrawn from the rollup chain. Given this base infrastructure, Arbitrum can support any smart contract based method for minting tokens in L2, and indeed we directly support Reddit's signature/claim based minting in L2.
Batch minting. What's better than a mint cookie? A whole batch! In addition to supporting Reddit’s current minting/claiming scheme, we built a second minting design, which we believe outperforms the signature/claim system in many scenarios.
In the current system, Reddit periodically issues signed statements to users, who then take those statements to the blockchain to claim their tokens. An alternative approach would have Reddit directly submit the list of users/amounts to the blockchain and distribute the tokens to the users without the signature/claim process.
To optimize the cost efficiency of this approach, we designed an application-specific compression scheme to minimize the size of the batch distribution list. We analyzed the data from Reddit's previous distributions and found that the data is highly compressible since token amounts are small and repeated, and addresses appear multiple times. Our function groups transactions by size, and replaces previously-seen addresses with a shorter index value. We wrote client code to compress the data, wrote a Solidity decompressing function, and integrated that function into Reddit’s contract running on Arbitrum.
When we ran the compression function on the previous Reddit distribution data, we found that we could compress batched minting data down to to 11.8 bytes per minting event (averaged over a 6-month trace of Reddit’s historical token grants)compared with roughly 174 bytes of on-chain data needed for the signature claim approach to minting (roughly 43 for an RLP-encoded null transaction + 65 for Reddit's signature + 65 for the user's signature + roughly 8 for the number of Points) .
The relative benefit of the two approaches with respect to on-chain call data cost depends on the percentage of users that will actually claim their tokens on chain. With the above figures, batch minting will be cheaper if roughly 5% of users redeem their claims. We stress that our compression scheme is not Arbitrum-specific and would be beneficial in any general-purpose smart contract platform.
8. Benchmarks and costs
In this section, we give the full costs of operating the Reddit contracts on an Arbitrum Rollup chain including the L1 gas costs for the Rollup chain, the costs of computation and storage for the L2 validators as well as the capital lockup requirements for staking.
Arbitrum Rollup is still on testnet, so we did not run mainnet benchmarks. Instead, we measured the L1 gas cost and L2 workload for Reddit operations on Arbitrum and calculated the total cost assuming current Ethereum gas prices. As noted below in detail, our measurements do not assume that Arbitrum is consuming the entire capacity of Ethereum. We will present the details of our model now, but for full transparency you can also play around with it yourself and adjust the parameters, by copying the spreadsheet found here.
Our cost model is based on measurements of Reddit’s contracts, running unmodified (except for the addition of a batch minting function) on Arbitrum Rollup on top of Ethereum.
On the distribution of transactions and frequency of assertions. Reddit's instructions specify the following minimum parameters that submissions should support:
Over a 5 day period, your scaling PoC should be able to handle:
  • 100,000 point claims (minting & distributing points)
  • 25,000 subscriptions
  • 75,000 one-off points burning
  • 100,000 transfers
We provide the full costs of operating an Arbitrum Rollup chain with this usage under the assumption that tokens are minted or granted to users in batches, but other transactions are uniformly distributed over the 5 day period. Unlike some other submissions, we do not make unrealistic assumptions that all operations can be submitted in enormous batches. We assume that batch minting is done in batches that use only a few percent on an L1 block’s gas, and that other operations come in evenly over time and are submitted in batches, with one batch every five minutes to keep latency reasonable. (Users are probably already waiting for L1 finality, which takes at least that long to achieve.)
We note that assuming that there are only 300,000 transactions that arrive uniformly over the 5 day period will make our benchmark numbers lower, but we believe that this will reflect the true cost of running the system. To see why, say that batches are submitted every five minutes (20 L1 blocks) and there's a fixed overhead of c bytes of calldata per batch, the cost of which will get amortized over all transactions executed in that batch. Assume that each individual transaction adds a marginal cost of t. Lastly assume the capacity of the scaling system is high enough that it can support all of Reddit's 300,000 transactions within a single 20-block batch (i.e. that there is more than c + 300,000*t byes of calldata available in 20 blocks).
Consider what happens if c, the per-batch overhead, is large (which it is in some systems, but not in Arbitrum). In the scenario that transactions actually arrive at the system's capacity and each batch is full, then c gets amortized over 300,000 transactions. But if we assume that the system is not running at capacity--and only receives 300,000 transactions arriving uniformly over 5 days-- then each 20-block assertion will contain about 200 transactions, and thus each transaction will pay a nontrivial cost due to c.
We are aware that other proposals presented scaling numbers assuming that 300,000 transactions arrived at maximum capacity and was executed in a single mega-transaction, but according to our estimates, for at least one such report, this led to a reported gas price that was 2-3 orders of magnitude lower than it would have been assuming uniform arrival. We make more realistic batching assumptions, and we believe Arbitrum compares well when batch sizes are realistic.
Our model. Our cost model includes several sources of cost:
  • L1 gas costs: This is the cost of posting transactions as calldata on the L1 chain, as well as the overhead associated with each batch of transactions, and the L1 cost of settling transactions in the Arbitrum protocol.
  • Validator’s staking costs: In normal operation, one validator will need to be staked. The stake is assumed to be 0.2% of the total value of the chain (which is assumed to be $1 per user who is eligible to claim points). The cost of staking is the interest that could be earned on the money if it were not staked.
  • Validator computation and storage: Every validator must do computation to track the chain’s processing of transactions, and must maintain storage to keep track of the contracts’ EVM storage. The cost of computation and storage are estimated based on measurements, with the dollar cost of resources based on Amazon Web Services pricing.
It’s clear from our modeling that the predominant cost is for L1 calldata. This will probably be true for any plausible rollup-based system.
Our model also shows that Arbitrum can scale to workloads much larger than Reddit’s nominal workload, without exhausting L1 or L2 resources. The scaling bottleneck will ultimately be calldata on the L1 chain. We believe that cost could be reduced substantially if necessary by clever encoding of data. (In our design any compression / decompression of L2 transaction calldata would be done by client software and L2 programs, never by an L1 contract.)
9. Status of Arbitrum Rollup
Arbitrum Rollup is live on Ethereum testnet. All of the code written to date including everything included in the Reddit demo is open source and permissively licensed under the Apache V2 license. The first testnet version of Arbitrum Rollup was released on testnet in February. Our current internal version, which we used to benchmark the Reddit contracts, will be released soon and will be a major upgrade.
Both the Arbitrum design as well as the implementation are heavily audited by independent third parties. The Arbitrum academic paper was published at USENIX Security, a top-tier peer-reviewed academic venue. For the Arbitrum software, we have engaged Trail of Bits for a security audit, which is currently ongoing, and we are committed to have a clean report before launching on Ethereum mainnet.
10. Reddit Universe Arbitrum Rollup Chain
The benchmarks described in this document were all measured using the latest internal build of our software. When we release the new software upgrade publicly we will launch a Reddit Universe Arbitrum Rollup chain as a public demo, which will contain the Reddit contracts as well as a Uniswap instance and a Connext Hub, demonstrating how Community Points can be integrated into third party apps. We will also allow members of the public to dynamically launch ecosystem contracts. We at Offchain Labs will cover the validating costs for the Reddit Universe public demo.
If the folks at Reddit would like to evaluate our software prior to our public demo, please email us at [email protected] and we'd be more than happy to provide early access.
11. Even more scaling: Arbitrum Sidechains
Rollups are an excellent approach to scaling, and we are excited about Arbitrum Rollup which far surpasses Reddit's scaling needs. But looking forward to Reddit's eventual goal of supporting hundreds of millions of users, there will likely come a time when Reddit needs more scaling than any Rollup protocol can provide.
While Rollups greatly reduce costs, they don't break the linear barrier. That is, all transactions have an on-chain footprint (because all calldata must be posted on-chain), albeit a far smaller one than on native Ethereum, and the L1 limitations end up being the bottleneck for capacity and cost. Since Ethereum has limited capacity, this linear use of on-chain resources means that costs will eventually increase superlinearly with traffic.
The good news is that we at Offchain Labs have a solution in our roadmap that can satisfy this extreme-scaling setting as well: Arbitrum AnyTrust Sidechains. Arbitrum Sidechains are similar to Arbitrum Rollup, but deviate in that they name a permissioned set of validators. When a chain’s validators agree off-chain, they can greatly reduce the on-chain footprint of the protocol and require almost no data to be put on-chain. When validators can't reach unanimous agreement off-chain, the protocol reverts to Arbitrum Rollup. Technically, Arbitrum Sidechains can be viewed as a hybrid between state channels and Rollup, switching back and forth as necessary, and combining the performance and cost that state channels can achieve in the optimistic case, with the robustness of Rollup in other cases. The core technical challenge is how to switch seamlessly between modes and how to guarantee that security is maintained throughout.
Arbitrum Sidechains break through this linear barrier, while still maintaining a high level of security and decentralization. Arbitrum Sidechains provide the AnyTrust guarantee, which says that as long as any one validator is honest and available (even if you don't know which one will be), the L2 chain is guaranteed to execute correctly according to its code and guaranteed to make progress. Unlike in a state channel, offchain progress does not require unanimous consent, and liveness is preserved as long as there is a single honest validator.
Note that the trust model for Arbitrum Sidechains is much stronger than for typical BFT-style chains which introduce a consensus "voting" protocols among a small permissioned group of validators. BFT-based protocols require a supermajority (more than 2/3) of validators to agree. In Arbitrum Sidechains, by contrast, all you need is a single honest validator to achieve guaranteed correctness and progress. Notice that in Arbitrum adding validators strictly increases security since the AnyTrust guarantee provides correctness as long as any one validator is honest and available. By contrast, in BFT-style protocols, adding nodes can be dangerous as a coalition of dishonest nodes can break the protocol.
Like Arbitrum Rollup, the developer and user experiences for Arbitrum Sidechains will be identical to that of Ethereum. Reddit would be able to choose a large and diverse set of validators, and all that they would need to guarantee to break through the scaling barrier is that a single one of them will remain honest.
We hope to have Arbitrum Sidechains in production in early 2021, and thus when Reddit reaches the scale that surpasses the capacity of Rollups, Arbitrum Sidechains will be waiting and ready to help.
While the idea to switch between channels and Rollup to get the best of both worlds is conceptually simple, getting the details right and making sure that the switch does not introduce any attack vectors is highly non-trivial and has been the subject of years of our research (indeed, we were working on this design for years before the term Rollup was even coined).
12. How Arbitrum compares
We include a comparison to several other categories as well as specific projects when appropriate. and explain why we believe that Arbitrum is best suited for Reddit's purposes. We focus our attention on other Ethereum projects.
Payment only Rollups. Compared to Arbitrum Rollup, ZK-Rollups and other Rollups that only support token transfers have several disadvantages:
  • As outlined throughout the proposal, we believe that the entire draw of Ethereum is in its rich smart contracts support which is simply not achievable with today's zero-knowledge proof technology. Indeed, scaling with a ZK-Rollup will add friction to the deployment of smart contracts that interact with Community Points as users will have to withdraw their coins from the ZK-Rollup and transfer them to a smart contract system (like Arbitrum). The community will be best served if Reddit builds on a platform that has built-in, frictionless smart-contract support.
  • All other Rollup protocols of which we are aware employ a centralized operator. While it's true that users retain custody of their coins, the centralized operator can often profit from censoring, reordering, or delaying transactions. A common misconception is that since they're non-custodial protocols, a centralized sequencer does not pose a risk but this is incorrect as the sequencer can wreak havoc or shake down users for side payments without directly stealing funds.
  • Sidechain type protocols can eliminate some of these issues, but they are not trustless. Instead, they require trust in some quorum of a committee, often requiring two-third of the committee to be honest, compared to rollup protocols like Arbitrum that require only a single honest party. In addition, not all sidechain type protocols have committees that are diverse, or even non-centralized, in practice.
  • Plasma-style protocols have a centralized operator and do not support general smart contracts.
13. Concluding Remarks
While it's ultimately up to the judges’ palate, we believe that Arbitrum Rollup is the bakeoff choice that Reddit kneads. We far surpass Reddit's specified workload requirement at present, have much room to optimize Arbitrum Rollup in the near term, and have a clear path to get Reddit to hundreds of millions of users. Furthermore, we are the only project that gives developers and users the identical interface as the Ethereum blockchain and is fully interoperable and tooling-compatible, and we do this all without any new trust assumptions or centralized components.
But no matter how the cookie crumbles, we're glad to have participated in this bake-off and we thank you for your consideration.
About Offchain Labs
Offchain Labs, Inc. is a venture-funded New York company that spun out of Princeton University research, and is building the Arbitrum platform to usher in the next generation of scalable, interoperable, and compatible smart contracts. Offchain Labs is backed by Pantera Capital, Compound VC, Coinbase Ventures, and others.
Leadership Team
Ed Felten
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States Chief Technology Officer and senior advisor to the President. He is an ACM Fellow and member of the National Academy of Engineering. Outside of work, he is an avid runner, cook, and L.A. Dodgers fan.
Steven Goldfeder
Steven Goldfeder is Co-founder and Chief Executive Officer at Offchain Labs. He holds a PhD from Princeton University, where he worked at the intersection of cryptography and cryptocurrencies including threshold cryptography, zero-knowledge proof systems, and post-quantum signatures. He is a co-author of Bitcoin and Cryptocurrency Technologies, the leading textbook on cryptocurrencies, and he has previously worked at Google and Microsoft Research, where he co-invented the Picnic signature algorithm. When not working, you can find Steven spending time with his family, taking a nature walk, or twisting balloons.
Harry Kalodner
Harry Kalodner is Co-founder and Chief Technology Officer at Offchain Labs where he leads the engineering team. Before the company he attended Princeton as a Ph.D candidate where his research explored economics, anonymity, and incentive compatibility of cryptocurrencies, and he also has worked at Apple. When not up at 3:00am writing code, Harry occasionally sleeps.
submitted by hkalodner to ethereum [link] [comments]

[ Bitcoin ] Technical: Taproot: Why Activate?

Topic originally posted in Bitcoin by almkglor [link]
This is a follow-up on https://old.reddit.com/Bitcoin/comments/hqzp14/technical_the_path_to_taproot_activation/
Taproot! Everybody wants it!! But... you might ask yourself: sure, everybody else wants it, but why would I, sovereign Bitcoin HODLer, want it? Surely I can be better than everybody else because I swapped XXX fiat for Bitcoin unlike all those nocoiners?
And it is important for you to know the reasons why you, o sovereign Bitcoiner, would want Taproot activated. After all, your nodes (or the nodes your wallets use, which if you are SPV, you hopefully can pester to your wallet vendoimplementor about) need to be upgraded in order for Taproot activation to actually succeed instead of becoming a hot sticky mess.
First, let's consider some principles of Bitcoin.
I'm sure most of us here would agree that the above are very important principles of Bitcoin and that these are principles we would not be willing to remove. If anything, we would want those principles strengthened (especially the last one, financial privacy, which current Bitcoin is only sporadically strong with: you can get privacy, it just requires effort to do so).
So, how does Taproot affect those principles?

Taproot and Your /Coins

Most HODLers probably HODL their coins in singlesig addresses. Sadly, switching to Taproot would do very little for you (it gives a mild discount at spend time, at the cost of a mild increase in fee at receive time (paid by whoever sends to you, so if it's a self-send from a P2PKH or bech32 address, you pay for this); mostly a wash).
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash, so the Taproot output spends 12 bytes more; spending from a P2WPKH requires revealing a 32-byte public key later, which is not needed with Taproot, and Taproot signatures are about 9 bytes smaller than P2WPKH signatures, but the 32 bytes plus 9 bytes is divided by 4 because of the witness discount, so it saves about 11 bytes; mostly a wash, it increases blockweight by about 1 virtual byte, 4 weight for each Taproot-output-input, compared to P2WPKH-output-input).
However, as your HODLings grow in value, you might start wondering if multisignature k-of-n setups might be better for the security of your savings. And it is in multisignature that Taproot starts to give benefits!
Taproot switches to using Schnorr signing scheme. Schnorr makes key aggregation -- constructing a single public key from multiple public keys -- almost as trivial as adding numbers together. "Almost" because it involves some fairly advanced math instead of simple boring number adding, but hey when was the last time you added up your grocery list prices by hand huh?
With current P2SH and P2WSH multisignature schemes, if you have a 2-of-3 setup, then to spend, you need to provide two different signatures from two different public keys. With Taproot, you can create, using special moon math, a single public key that represents your 2-of-3 setup. Then you just put two of your devices together, have them communicate to each other (this can be done airgapped, in theory, by sending QR codes: the software to do this is not even being built yet, but that's because Taproot hasn't activated yet!), and they will make a single signature to authorize any spend from your 2-of-3 address. That's 73 witness bytes -- 18.25 virtual bytes -- of signatures you save!
And if you decide that your current setup with 1-of-1 P2PKH / P2WPKH addresses is just fine as-is: well, that's the whole point of a softfork: backwards-compatibility; you can receive from Taproot users just fine, and once your wallet is updated for Taproot-sending support, you can send to Taproot users just fine as well!
(P2WPKH and P2WSH -- SegWit v0 -- addresses start with bc1q; Taproot -- SegWit v1 --- addresses start with bc1p, in case you wanted to know the difference; in bech32 q is 0, p is 1)
Now how about HODLers who keep all, or some, of their coins on custodial services? Well, any custodial service worth its salt would be doing at least 2-of-3, or probably something even bigger, like 11-of-15. So your custodial service, if it switched to using Taproot internally, could save a lot more (imagine an 11-of-15 getting reduced from 11 signatures to just 1!), which --- we can only hope! --- should translate to lower fees and better customer service from your custodial service!
So I think we can say, very accurately, that the Bitcoin principle --- that YOU are in control of your money --- can only be helped by Taproot (if you are doing multisignature), and, because P2PKH and P2WPKH remain validly-usable addresses in a Taproot future, will not be harmed by Taproot. Its benefit to this principle might be small (it mostly only benefits multisignature users) but since it has no drawbacks with this (i.e. singlesig users can continue to use P2WPKH and P2PKH still) this is still a nice, tidy win!
(even singlesig users get a minor benefit, in that multisig users will now reduce their blockchain space footprint, so that fees can be kept low for everybody; so for example even if you have your single set of private keys engraved on titanium plates sealed in an airtight box stored in a safe buried in a desert protected by angry nomads riding giant sandworms because you're the frickin' Kwisatz Haderach, you still gain some benefit from Taproot)
And here's the important part: if P2PKH/P2WPKH is working perfectly fine with you and you decide to never use Taproot yourself, Taproot will not affect you detrimentally. First do no harm!

Taproot and Your Contracts

No one is an island, no one lives alone. Give and you shall receive. You know: by trading with other people, you can gain expertise in some obscure little necessity of the world (and greatly increase your productivity in that little field), and then trade the products of your expertise for necessities other people have created, all of you thereby gaining gains from trade.
So, contracts, which are basically enforceable agreements that facilitate trading with people who you do not personally know and therefore might not trust.
Let's start with a simple example. You want to buy some gewgaws from somebody. But you don't know them personally. The seller wants the money, you want their gewgaws, but because of the lack of trust (you don't know them!! what if they're scammers??) neither of you can benefit from gains from trade.
However, suppose both of you know of some entity that both of you trust. That entity can act as a trusted escrow. The entity provides you security: this enables the trade, allowing both of you to get gains from trade.
In Bitcoin-land, this can be implemented as a 2-of-3 multisignature. The three signatories in the multisgnature would be you, the gewgaw seller, and the escrow. You put the payment for the gewgaws into this 2-of-3 multisignature address.
Now, suppose it turns out neither of you are scammers (whaaaat!). You receive the gewgaws just fine and you're willing to pay up for them. Then you and the gewgaw seller just sign a transaction --- you and the gewgaw seller are 2, sufficient to trigger the 2-of-3 --- that spends from the 2-of-3 address to a singlesig the gewgaw seller wants (or whatever address the gewgaw seller wants).
But suppose some problem arises. The seller gave you gawgews instead of gewgaws. Or you decided to keep the gewgaws but not sign the transaction to release the funds to the seller. In either case, the escrow is notified, and if it can sign with you to refund the funds back to you (if the seller was a scammer) or it can sign with the seller to forward the funds to the seller (if you were a scammer).
Taproot helps with this: like mentioned above, it allows multisignature setups to produce only one signature, reducing blockchain space usage, and thus making contracts --- which require multiple people, by definition, you don't make contracts with yourself --- is made cheaper (which we hope enables more of these setups to happen for more gains from trade for everyone, also, moon and lambos).
(technology-wise, it's easier to make an n-of-n than a k-of-n, making a k-of-n would require a complex setup involving a long ritual with many communication rounds between the n participants, but an n-of-n can be done trivially with some moon math. You can, however, make what is effectively a 2-of-3 by using a three-branch SCRIPT: either 2-of-2 of you and seller, OR 2-of-2 of you and escrow, OR 2-of-2 of escrow and seller. Fortunately, Taproot adds a facility to embed a SCRIPT inside a public key, so you can have a 2-of-2 Taprooted address (between you and seller) with a SCRIPT branch that can instead be spent with 2-of-2 (you + escrow) OR 2-of-2 (seller + escrow), which implements the three-branched SCRIPT above. If neither of you are scammers (hopefully the common case) then you both sign using your keys and never have to contact the escrow, since you are just using the escrow public key without coordinating with them (because n-of-n is trivial but k-of-n requires setup with communication rounds), so in the "best case" where both of you are honest traders, you also get a privacy boost, in that the escrow never learns you have been trading on gewgaws, I mean ewww, gawgews are much better than gewgaws and therefore I now judge you for being a gewgaw enthusiast, you filthy gewgawer).

Taproot and Your Contracts, Part 2: Cryptographic Boogaloo

Now suppose you want to buy some data instead of things. For example, maybe you have some closed-source software in trial mode installed, and want to pay the developer for the full version. You want to pay for an activation code.
This can be done, today, by using an HTLC. The developer tells you the hash of the activation code. You pay to an HTLC, paying out to the developer if it reveals the preimage (the activation code), or refunding the money back to you after a pre-agreed timeout. If the developer claims the funds, it has to reveal the preimage, which is the activation code, and you can now activate your software. If the developer does not claim the funds by the timeout, you get refunded.
And you can do that, with HTLCs, today.
Of course, HTLCs do have problems:
Fortunately, with Schnorr (which is enabled by Taproot), we can now use the Scriptless Script constuction by Andrew Poelstra. This Scriptless Script allows a new construction, the PTLC or Pointlocked Timelocked Contract. Instead of hashes and preimages, just replace "hash" with "point" and "preimage" with "scalar".
Or as you might know them: "point" is really "public key" and "scalar" is really a "private key". What a PTLC does is that, given a particular public key, the pointlocked branch can be spent only if the spender reveals the private key of the given private key to you.
Another nice thing with PTLCs is that they are deniable. What appears onchain is just a single 2-of-2 signature between you and the developemanufacturer. It's like a magic trick. This signature has no special watermarks, it's a perfectly normal signature (the pledge). However, from this signature, plus some datta given to you by the developemanufacturer (known as the adaptor signature) you can derive the private key of a particular public key you both agree on (the turn). Anyone scraping the blockchain will just see signatures that look just like every other signature, and as long as nobody manages to hack you and get a copy of the adaptor signature or the private key, they cannot get the private key behind the public key (point) that the pointlocked branch needs (the prestige).
(Just to be clear, the public key you are getting the private key from, is distinct from the public key that the developemanufacturer will use for its funds. The activation key is different from the developer's onchain Bitcoin key, and it is the activation key whose private key you will be learning, not the developer's/manufacturer's onchain Bitcoin key).
So:
Taproot lets PTLCs exist onchain because they enable Schnorr, which is a requirement of PTLCs / Scriptless Script.
(technology-wise, take note that Scriptless Script works only for the "pointlocked" branch of the contract; you need normal Script, or a pre-signed nLockTimed transaction, for the "timelocked" branch. Since Taproot can embed a script, you can have the Taproot pubkey be a 2-of-2 to implement the Scriptless Script "pointlocked" branch, then have a hidden script that lets you recover the funds with an OP_CHECKLOCKTIMEVERIFY after the timeout if the seller does not claim the funds.)

Quantum Quibbles!

Now if you were really paying attention, you might have noticed this parenthetical:
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash...)
So wait, Taproot uses raw 32-byte public keys, and not public key hashes? Isn't that more quantum-vulnerable??
Well, in theory yes. In practice, they probably are not.
It's not that hashes can be broken by quantum computes --- they're still not. Instead, you have to look at how you spend from a P2WPKH/P2PKH pay-to-public-key-hash.
When you spend from a P2PKH / P2WPKH, you have to reveal the public key. Then Bitcoin hashes it and checks if this matches with the public-key-hash, and only then actually validates the signature for that public key.
So an unconfirmed transaction, floating in the mempools of nodes globally, will show, in plain sight for everyone to see, your public key.
(public keys should be public, that's why they're called public keys, LOL)
And if quantum computers are fast enough to be of concern, then they are probably fast enough that, in the several minutes to several hours from broadcast to confirmation, they have already cracked the public key that is openly broadcast with your transaction. The owner of the quantum computer can now replace your unconfirmed transaction with one that pays the funds to itself. Even if you did not opt-in RBF, miners are still incentivized to support RBF on RBF-disabled transactions.
So the extra hash is not as significant a protection against quantum computers as you might think. Instead, the extra hash-and-compare needed is just extra validation effort.
Further, if you have ever, in the past, spent from the address, then there exists already a transaction indelibly stored on the blockchain, openly displaying the public key from which quantum computers can derive the private key. So those are still vulnerable to quantum computers.
For the most part, the cryptographers behind Taproot (and Bitcoin Core) are of the opinion that quantum computers capable of cracking Bitcoin pubkeys are unlikely to appear within a decade or two.
So:
For now, the homomorphic and linear properties of elliptic curve cryptography provide a lot of benefits --- particularly the linearity property is what enables Scriptless Script and simple multisignature (i.e. multisignatures that are just 1 signature onchain). So it might be a good idea to take advantage of them now while we are still fairly safe against quantum computers. It seems likely that quantum-safe signature schemes are nonlinear (thus losing these advantages).

Summary

I Wanna Be The Taprooter!

So, do you want to help activate Taproot? Here's what you, mister sovereign Bitcoin HODLer, can do!

But I Hate Taproot!!

That's fine!

Discussions About Taproot Activation

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submitted by anticensor_bot to u/anticensor_bot [link] [comments]

TkeyNet: What’s new?

TkeyNet: What’s new?

https://i.redd.it/zyuf3vxvvdp51.gif
“The TkeyNet development team is surprising to us” — recently such a quote came from our lips. Why would that be?

TkeyNet: Instant transactions

Now transactions in the TkeyNet network are instant. You won’t even notice how the TKEY delivers to the recipient. For example, when you send a payment from card to card, and after a few seconds, the money is in the recipient’s possession. Despite the fast speed of transactions, the system has not only preserved its security properties but also strengthened them and still works on the blockchain.
“The chain of information a store on every computer in the network. The addition of information occurs by using cryptographic functions, allowing you to identify the information for any period. When a new data block adds to the TkeyNet network, the integrity of all previous information confirm by the entire TkeyNet, and each node checks its integrity.”

Financial marketplace


https://preview.redd.it/4j6y85zxvdp51.png?width=1920&format=png&auto=webp&s=1ef221053e4e90b08a9f67e6eef220b74bc94b0f
In early September, we completed work on one of the main functions of the system: “The Financial Module Of The Marketplace.”

What is it for, and how does the “Financial Marketplace module” work?

TkeyNet combines various assets in a single system, creating instant access to liquidity. Digital exchanges connect to TkeyNet and provide assets for exchange: BTC, USDT, ETH, and others. For example, Kraken connects to TkeyNet and provides digital assets: ETH, ETC. Binance: USD, BTC. Bitfinex: USDT, EOS, etc. Exchanges can provide any assets that trade on their platforms.
The blockchain acts as a Registrar of financial transactions. Accounts, balances, and orders store in a distributed registry TkeyNet, and copies of data to distribute across network TkeyNet nodes. Payment routing is implemented in the TkeyNet system, which allows you to track not only balances but also distribute transactions without the participation of any party.
The user, in turn, has quick access to transactions with digital currencies, regardless of the blockchain used: Bitcoin, Ethereum, EOS, or any other, transactions are recorded in TkeyNet, and transactions are processed instantly.
“The task of the platform is to automate the interaction of the parties and ensure the convenience of performing operations. — This is the core element of a trusted environment.”
In addition to digital assets, the “Financial Marketplace module” includes working with Fiat currencies, stocks, bonds, as well as raw materials: oil, gas, diamonds, etc. — This means that payment systems, banks, currency exchanges, commodity exchanges, and other financial market participants, are also connected to the TkeyNet blockchain.

Payments between companies in a few seconds

https://preview.redd.it/v84fizszvdp51.png?width=1920&format=png&auto=webp&s=e501b06661b2a960fe75abe07a1aba5177db620d
Companies can make payments in seconds, not days. TkeyNet can seriously mitigate the adverse risks of extraterritorial sanctions against the financial system of the countries if such follow. Also, the ability to conduct internal and cross-border transfers through an independent financial channel directly to the counterparty at high-speed is beneficial to business and the state from any point of view.
Each user will be able to make quick transfers to counterparty wallets, exchange digital currency for another or fiat money at the current exchange rate.

What else is interesting? — Applications

Developers can connect to TkeyNet and get access to a large-scale pool of liquidity: digital currencies, stocks, precious metals, etc.
This solution not only reduces development costs but also allows you to get access to the best prices and fast exchanges. You can create any financial application, regardless of the market usage: a cryptocurrency, or financial markets.
Developers can create a digital Bank or exchange, fast connect the app, and TkeyNet using the API.
“By working with partners around the world, we can significantly increase our market share in this business, providing our partners with ready-made tools without risks.”
And also regardless of the applications that will be created by partner developers. The company will provide its interfaces that will provide access to various types of assets — digital currencies: BTC, USDT, ETH, etc.; Fiat currencies: euros, dollars, pounds, etc.; securities and commodity assets.

https://preview.redd.it/23whmnm1wdp51.png?width=679&format=png&auto=webp&s=52bf10bf43268f835cff981a110d41528b838a89
Anywhere in the world, at any time, the system user will have access to the desired currency without having to exchange one for another. Also, when implementing the application for NFC payments, it will become even easier to use the system. However, even with the availability of several types of currencies, such as the pound, dollar, and euro, it is easy to make payments abroad.
“According to the World Bank, more than 1.7 billion adults are still not covered by banking services, but two-thirds of them have a mobile phone that can help them access financial services. — This tells us one thing: the traditional banking approach is exceptionally inefficient. Lack of infrastructure: a network of ATMs, fees and deposits, a network of cashiers, and internal money transfer programs are just some named obstacles to creating a real banking experience.”
Imagine that in one app you have access to Apple shares, Tesla shares, gold, precious metals, rubles, dollars, and even oil if you want. TkeyNet — makes this possible.
TkeyNet is an industrial solution designed for companies and users at the same time. Since payments in the system are very fast, a person can store and send money in any asset they want. This flexibility creates an open market, which is necessary at present.

Postscript

TkeyNet back-end — completed. Currently, we are actively working on the front-end side. Regardless of working on the front-end side, the TkeyNet system is tested on an ongoing basis.
submitted by tkeycoin to Tkeycoin_Official [link] [comments]

What I currently use for privacy

So this is what software I currently use for privacy, would like some opinions if possible:
Starting with my cellphone, my device is a Google Pixel 3A XL with GrapheneOS flashed, I have the following apps installed:
F-Droid and AuroraOSS (as my app stores), NewPipe (youtube client), Vanadium (web browser), Tutanota and K-9 Mail (for e-mails), OsmAnd+ (for maps), Joplin (notes), Open Camera (camera), OpenBoard and Mozc for Android (Keyboard and Japanese Keyboard), Aegis Authenticator, KeePassDX (password manager), LibreTorrent (torrent client), Librera PRO (pdf/epub/mobi reader, I don't own a Kindle nor want to own one so I use my cellphone to read), Tachiyomi (manga reader), Signal (for messaging), Vinyl Music Player, VLC, Simple Gallery Pro and Simple Calendar Pro (I prefer them over stock Graphene options) and I also use Electrum and Samourai (Bitcoin Wallet) and Monerujo (Monero Wallet)
I also have OpenVPN (for VPN) and use a private DNS for ad and tracking blocking (provided by my VPN provider)
I have 3-4 PCs, will go over every single one of them:
my main PC is a desktop PC (that I built myself) that I mainly use for working and other tasks.
It runs Artix Linux (basically Arch Linux without systemd), I use UFW as my firewall (denying all incoming and also denying all outgoing only allowing what is useful) and I also use AppArmor Profiles, I disabled IPV6 and SWAP, configured my VPN connection as well on network settings and I currently run OpenVPN on my computer (my VPN provider allows for multi-hop cascade through OpenVPN in which I can create a custom VPN cascade up to four servers, each consecutive hop re-encrypts my traffic and assigns me a new IP address) and I've also set disk encryption on installation (have set in all of my computers)
As for software: I use Mozilla Firefox as my web browser (I set it to always be in private mode, unchecked suggestions for browsing history, bookmarks, and open tabs, I've also disabled the Firefox data collection in settings and block dangerous and deceptive content, I use DuckDuckGo as my search engine, I use Firefox Home as my default as my homepage. The rest of my tweaks were done in about:config (using privacytools.io site tweaks + geo.enabled = false, network.cookie.lifetimePolicy = 2 and dom.security.https_only_mode as true which are not listed on the site) and the only addons I use are uBlock Origin on Hard Mode and Decentraleyes), KeePassXC (password manager), VIM (use it as a Text Editor and as an IDE for coding), LibreOffice (for working stuff), GIMP (image editor), VLC, qBitTorrent and Tutanota's Desktop Client and Thunderbird (for e-mails)
I also use KVM/QEMU for virtual machines (usually in case I wanna test some distro or use Tails/Whonix)
For my gaming PC (also a desktop I've built myself) I run Manjaro KDE on it, the only apps I have in the system are Firefox (same settings as above), OBS and KVM/QEMU (which I use a Win10 virtual machine for games, there are tutorials on YouTube on how to do so if you're interested). I have the same firewall settings as above, using AppArmor as well and I've also disabled IPV6 and SWAP, I run OpenVPN on it as well as my VPN DNS settings on network settings. I also use different mouse and keyboard on both my PCs and never mix them together.
My other 2 PCs are both laptops, one is a Acer Aspire Nitro I've bought for work (in case I need to work while in a trip or if I wanna work outside etc), it has the same settings and programs as my main PC but I run Gentoo on it. The other laptop is an old ThinkPad that runs Slackware on it, but I rarely use it and this laptop is most of the times not with me for safety reasons.
For some other devices and stuff: I have an Asus RT-AC86U router with OpenWRT flashed on it that I also run OpenVPN config files (this one coming from another provider, I use two VPN providers, on in my PCs and the other in my router), I have a Ledger Nano S as a hardware wallet for both Bitcoin and Monero (most of my cryptocurrency is there, I use hardware wallet for hodling purposes and as my emergency funding) and I have LOTS of USB flash drivers (all of them for Linux Live ISOs purposes), I also have a Nintendo Switch Lite (only gaming console I have, although have not been playing that much on it recently) that I only connect to the internet in case I need to download some updates or play online and after I'm done I immediately disconnect it from the internet.
Some other privacy habits I have are:
I don't own any smart device like Smart TVs (I've been more than 10 years now without watching TV, doesn't even bother me), Smart Fridges or Dishwashers that connect to your internet, ROOMBAS, Smart Home etc, I keep all my money on crypto (and I have a small amount in gold as well, but I rarely invest on it, all my gold is stored in a manual safe here in my apartment) and I only have like, 10 bucks or so in my back account (as soon as I receive any money I just left the necessary in my account to pay bills and put all the rest on crypto, I try to pay everything on crypto or cash), I RARELY use cloud storage, but if I need to, I go with NextCloud and encrypt all my files with VeraCrypt before uploading it, all my VPN services were paid with Bitcoin (I try to pay everything with crypto as previously said) and I never write directly into any website, I usually write my text on a text editor, copy it and paste it on the website (needless to say that I don't use mainstream social media as well)
So, what do you guys think? anything that you would add your recommend me? (before anyone mentions about self-hosting a DNS server using Pi-hole on a Raspberry Pi, I'm actually thinking on doing it in a near future)
EDIT: forgot to mention that I don't watch YouTube on PC on youtube site, I mostly watch youtube's videos on invidio.us and only use the youtube site for watching live streams honestly. And I also barely go outside with my smartphone (only if I really need to) and I usually keep it away from my computers etc.
EDIT 2: also another thing: I covered all my laptop's webcams with black electrical tape, I have a Logitech C922 Pro webcam for my desktop PCs but rarely use it, and when I need to use it, I unplug it as soon as I'm done with it.
submitted by SlackAcademic to privacytoolsIO [link] [comments]

Building an Ethereum Mining Rig - Part 2

First update to the guide "Building a 6Gpu Mining Rig for Ethereum" - Let's talk about Claymore.
This update supplements and does not replace the Guide to Build a 6GPU Mining Rig for Ethereum published on our site.

The substantial differences are due to the installation of the latest version of the Windows 10 Operating System, the mining on the Ethermine pool (in our opinion simpler than Dwarfpool) and the use of the XFX RX 580 8gb GPUs.

The first variant is found in Part 4 of the guide: the environment variables are not to be entered as they will be integrated directly into the bat file to start mining.

The second variant is found in Part 7 of the guide and leads us to "mine" on a different pool using the Claymore software.
Download the latest version at the following link: https://github.com/Claymore-Dual/Claymore-Dual-Miner

Once downloaded, unzip everything on a folder on your desktop and open the start.bat file with notepad. Clear the contents and copy the following command:

start config.dll -epool eu1.ethermine.org:14444 -ewal "your ETH wallet address" -epsw x -worker "worker"
EthDcrMiner64.exe

Where instead of "your wallet address" you will have to put your Ethererum wallet - obviously without the quotes - and instead of worker you will put an identification number in case you build more RIGs (such as RIG1, RIG2, etc ...). We opted for the eu1 pool even if some on the discussion forums believe that the us1 is more profitable.

At the following link, many other useful commands for your Rig:
https://github.com/Claymore-Dual/Claymore-Dual-Miner


The Ethermine pool offers a very well crafted and descriptive interface. In the Payouts section, after only 5 minutes of mining, you can decide the minimum amount of Ether to be transferred to your wallet by simply entering the IP address of the RIG.

We have decided to mine directly on the Ethereum address of our Exodus wallet. It is not recommended to mine directly on Coinbase, as reported on the site itself. Sin.

Nothing should be left to chance when you decide to build a mining rig for Ethereum.
The third variant is the most difficult of all. Once you have reached Part 5 of the guide, you can decide whether to continue or follow this update / variant. If you are here it is probably because you have run into some problem that the guide does not allow you to solve.

With the latest version of Windows 10, you may run into a kernel conflict between the operating system and AMD's Radeon Software Crimson ReLive Edition Beta for Blockchain Compute drivers. This conflict will prevent you from using Atiflash after installing the drivers.

Important: Before making any changes to the BIOS, please backup each GPU.

Important: first of all flash the GPUs with the original bios if for any reason you are forced to reinstall the operating system.


Still on Atiflash.
The advice would therefore be to flash the GPUs and then install the AMD drivers. Let's say it would be because you may run into another problem this time related to the GPUs themselves. Since each video card is different from any other, the bios mod of the GPU could crash the operating system showing the classic blue screen and displaying an error related to the Atimkdag.sys file.

This could be due to the fact that some GPUs have significantly higher performance in the calculation phase than others. We could call it a factory overclock but not using them for gaming we cannot say it with absolute certainty.

Having assessed these two drawbacks, the only safe solution is to flash all the GPUs, disconnect them except for the first one, install the Blockchain drivers (plus Atimkdag patch) and launch the mining command verifying that the operating system does not go into crash in the next 5 minutes.

Turn off the rig again and connect the second GPU so on up to the sixth. In the event that one or more video cards should crash the system, disconnect them. After that, it uses DDU from the provisional mode and flashes these GPUs with their original bios. At this point, connect them again, reinstall the Blockcain drivers (plus Atimkdag patch) and start mining definitively.

All the operations related to the use of Atiflash, DDU and driver installation are reported in Part 5 and Part 6 of our guide.
A little bit of Overclocking.
You will certainly find significant differences in performance between the GPUs.

At this point all that remains is to "operate" with an overclocking software. We opt for OverdriveNtool. Our constantly updated guide is available at the following link: https://www.cryptoall.it/2019/10/12/complete-guide-to-overdriventool/

Link to the official YouTube channel for verification: https://www.youtube.com/channel/UCdE9TTHAOtyKxy59rALSprA

GPUs with modified bios will not leave much room for modification. You will have to proceed with the most extreme overclocking on those that mount the original bios; obviously always in small steps by saving the profile for each GPU. Our guide explains in detail how to do it.

Hoping to have been of help, we give everyone an appointment for the second part of the update on how to build an Ethereum mining rig in which we will explain in detail the dual mining on the Ethermine pool.

See you soon.


If you liked this article and would like to contribute with a donation:

Bitcoin: 1Ld9b165ZYHZcY9eUQmL9UjwzcphRE5S8Z
Ethereum: 0x8D7E456A11f4D9bB9e6683A5ac52e7DB79DBbEE7
Litecoin: LamSRc1jmwgx5xwDgzZNoXYd6ENczUZViK
Stellar: GBLDIRIQWRZCN5IXPIKYFQOE46OG2SI7AFVWFSLAHK52MVYDGVJ6IXGI
Ripple: rUb8v4wbGWYrtXzUpj7TxCFfUWgfvym9xf

By: cryptoall.it Telegram Channel: t.me/giulo75 Netbox Browser: https://netbox.global/PZn5A
submitted by Giulo75 to u/Giulo75 [link] [comments]

What's the difference between Bitcoin and traditional currency?

Bitcoin can be used as an electronic payment method. At this level, it is a bit like the traditional US dollar, euro and Japanese yen, because these can also be traded electronically, but it is still very different from the traditional Legal currency.
  1. Decentralization
The most important feature of Bitcoin is decentralization. There is no single organization to control Bitcoin network. It is maintained by a group of engineer volunteers and runs on the global open dedicated computers, which attracts those who are dissatisfied with the full control of banks or government agencies over their money.
Bitcoin solves the "secondary use problem" of electronic currency (because general electronic assets are easy to be copied and reused), and it is through an original cryptography and economic incentive mechanism.
In the traditional electronic legal currency, this function is realized by the bank, which gives the bank absolute control in the traditional financial system.
However, through Bitcoin, the integrity of transactions is maintained by a distributed open network that does not belong to anyone, and no one has absolute control.
  1. Limited supply
Legal currency, such as US dollar, euro, Japanese yen, etc., the central bank can issue any number of currencies, and also try to control the exchange rate of one currency to another. The holders of currencies, especially citizens who have no other choice, need to bear this risk.
For Bitcoin, its supply is strictly controlled according to the underlying algorithm. A small amount of new Bitcoin is generated every hour, and it will be generated at a gradually reduced rate until the total number reaches 21 million.
Moreover, due to the limited number of Bitcoin, it will not be issued at will. Bitcoin has a high holding value.
  1. Constancy
Unlike the electronic Legal currency, the transaction of Bitcoin is irrevocable. If the transaction is recorded on the network and has passed for an hour, it can't be changed.
Although this situation may upset some people, it also means that no transaction on the Bitcoin network can be tampered with.
  1. Anonymity
The identity of traditional electronic payment initiators is generally identified, to cooperate with anti money laundering laws and other regulations. However, Bitcoin users are semi anonymous in theory, because there is no authentication center, and Bitcoin users do not need to prove their identity when transferring.
In practice, each user is identified by the address of the wallet, and the transaction can be traced in this way.
  1. Separability
The smallest Bitcoin unit is called Cong, which is one hundred million times of a Bitcoin. It can support Bitcoin to do micro transactions that traditional electronic currencies cannot.
But the value of Bitcoin depends on how many people, goods and services are willing to accept this payment. If the number of people in accepting Bitcoin increases, the market will further flourish, and Bitcoin will have a huge appreciation space. If the number of Bitcoin users decreases, its value is likely to decline.
submitted by top1markets to forex_trades [link] [comments]

Mistakes everyone makes when buying bitcoins

Mistakes everyone makes when buying bitcoins

https://preview.redd.it/5y5f9gl55zd51.jpg?width=1024&format=pjpg&auto=webp&s=1b534fce03467a0771518e8a6e93e4ad8eb9e67e
In any trade, being a novice means you will make some blunders. Mistakes make life difficult, and then you get the impression that you will never stop being a novice.
The same happens in the bitcoin industry - a large number of people make mistakes that are inherent only to beginners. Of course, it's greater to learn from other people's mistakes. But how can we make sure that there are fewer of our own?
Let's take a look at some of the most common mistakes that you need to avoid before you buy bitcoin in Los Angeles

You haven't done your research
Before you "buy bitcoin in Los Angeles", of course, you should do your research. After all, you are going to invest in bitcoin money that has been earned through hard work, and therefore you need to have a good knowledge of what bitcoins are and what your next steps may lead to.
Well, it is not sufficient to just listen to friends or "experts" on the Internet who can "help" you to drain your money.
Do a little research before entering the world of bitcoins. You need to understand the above, and only then join the trade.

Your only aim for huge profits.
Many miners are now millionaires, so you might want to buy your hardware and start the mining process. However, one should not get involved in it without studying it thoroughly and keeping in mind only high profits. Mining requires a lot of power and will need to pay huge bills that can cost more than your mining profit.

https://preview.redd.it/yyn8wvn75zd51.jpg?width=1400&format=pjpg&auto=webp&s=0a755c24637889ccf4a7b5852c368bc64ba92a6e
You are impatient
This is another mistake that you need to avoid before you think to "buy bitcoin in Los Angeles" It is hard to be patient, but patience and calmness must always be maintained. There will always be third parties or factors that push you to buy or sell, but if you are patient with your crypto coins, you will be rewarded. Short-term and occasional gains from trading are certainly good, but in general, you need to stick to a strategy and plan accordingly.

Don’t have private keys from your bitcoins
This clause concerns the security of your coins and the privacy of the data that provide access to them. You should always have your private keys because wallets can crash, exchanges can be hacked, and your losses can cost thousands of dollars.

Don't have copies of your passwords.
You should have offline, offline copies of all your passwords, private keys, and other important data if you don't want to say goodbye to your money forever. This is important because you will need to access all of your cryptocurrencies even if your computer crashes or gets stolen.

https://preview.redd.it/dst8jkg85zd51.jpg?width=2000&format=pjpg&auto=webp&s=672b36e262a1266c194bd85f444ffcc86680de8f
You are afraid that you will miss something
This is one of the biggest problems in the cryptocurrency world. There are many success stories, but it is not always possible to guess what will be good for you. This syndrome can push you to make rash decisions. However, it should be understood that you will only miss some things, but not all.
Well, these were the most common mistakes beginners make before you "buy bitcoin in Los Angeles". You should try to remember them to avoid them in the future.
Feel free to Sign up at xCoins and receive bitcoin in just minutes!
submitted by Bitcoininvestors0 to u/Bitcoininvestors0 [link] [comments]

Recovering an old wallet

So back in 2013 I had a laptop mine some bitcoin for a few weeks, likely not much but maybe something at todays value. I have the old folder with the files in it other than the blocks that got deleted during some computer files crap purge. I have no idea what program I used to mine them though RPC does ring a bell. I tried to download Core on to the same computer they would of been mined on but has way too many issues. I have Core fully up and running on another computer and am just wondering if it is as easy as copying over the folder with the chainestate, debug, wallet and so on? I'm sure this has been asked before but can't really find a situation similar to mine! Thanks everyone! HODL!
submitted by Lumpy21 to Bitcoin [link] [comments]

I ruin people's lives for fun, this is my story.

Let me start by introducing myself, my name is Alex. I am 20 years old and clinically diagnosed with ASPD or Antisocial personality disorder. My diagnosis was given to me back in high school in my Junior year. It was pretty hard making friends or at least keeping them. You see when I try to make friends I usually only go into a relationship because of one thing; to get something in return. You could call it manipulating or deceiving people but, I don’t see it that way. I’ve had many therapists and physiatrists try to help me or figure out what’s wrong with me in the past but, I would just feed them the information they want to hear. Its pretty simple, give them all the shit they need to write down on their little piece of paper and it is music to their ears. Besides that, let us get to the story. Now you see the two key people back in high school were “Mike” and “Connor” and they were it. They had the girls, the popularity, the friends. They both were the biggest athletes in the entire school. This is important because I wanted that, but I couldn’t have it. Call it jealousy or whatever but, who wouldn’t want people to look up at you and have their names written in the daily paper.
High school was a bitch for me. I never had many friends or any real ones at least. I was known as the weird kid but, whatever right. Everyone says high school is tough for everyone. I believe it. Life gets back at people who deserve it though. Now Mike was the quarterback of the football team and he knew everyone and everyone knew him. I one day sent him a message on Snapchat and said: “Hey Mike, I know you don’t know me but, I think you’re a cool guy.” He then replied with “Who are you? Whatcha want dickhead?” I told him “Nothing much man, just thought we could be friends or something, we’re in the same Spanish class.” He said, “Oh, cool your that kid that sits in the back right?” I said, “Yeah, what you doing?” He then said, “Nothing much man, listen I got a party next weekend with a free crib if you tryna come.” I then told him I’d let him know. This was perfect because I knew exactly what I would do. I planned on seeing Connor there with his girlfriend Liz. That was important because I hated seeing the way Connor would treat her. He just used her for sex and shit and never really respected her. I knew how I would fix that though, and it would be at that party.
Well, I got to the party and there were at least 50 kids there. I saw a couple of familiar faces but couldn’t care at all. I was there for one thing and one thing only. To ruin their relationship. Call me a dick but, he was way worse than me. I once saw Liz come into school with a bruise on her face and knew it was from him. I finally saw them out back near the pool. I had a plan. I would text Connor’s phone from a different number making it look like it was some other chick texting him and Liz would be right there to see it. I went outside and he was drinking, probably already drunk. I could see them from across the pool and haven’t seen Mike yet. I was about to text him and then Mike came up and tapped me on my shoulder with two drinks in his hand. He said “Yooo, Alex you came!” I laughed awkwardly and said, “Yeah man, wouldn’t miss it.” He said, “You want a drink?” Gesturing the second cup to me. I took it and said “Thanks, man.” He said, “I’ll see you around, there’s more beer in the kitchen.” He walked away and now I pulled my phone out. I went on to the app which I would text him from and texted: “Hey Connor, I had a really good night last night with a winkie emoji.” I then sent it waiting for Liz to look over his shoulder. She did and read the message. They started to argue and Liz poured his beer all over his face. My plan was working just right. I then saw Liz walk inside in a rush. I pretended to bump into her and said: “Oh my fault didn’t see you there.” She laughed and said, “Oh my god, it’s you, Alex.” I then laughed as well and said, “You good?” She replied with, “No actually, I just found out Connor was cheating on me with some slut.” I said “Oh, that blows … you want a ride home?” She said, “No I’m good, I’ll just have Grace drive me home.” I preceded with, “You sure, I live super close to here anyways, I was just about to go home too.” She said, “Ok, sure that’s fine.” I then got in my car and we started to talk. I said, “So, how’d you find out?” She said, “Some bitch texted him saying that they slept together last night.” I then said, “Damn, what’s your address by the way?” She then said something that surprised me. “I can’t go home like this, my moms gonna know I’m drunk and I’ll never be able to go out again.” I said, “Well, what you wanna do then?” She said, “Um, I don’t know .. we should go to a park.” I said, “Oh ok, what park?” She gave me the name and we went there. I parked my car in the parking lot and said: “Whatcha tryna do now?” She then said, “Shut up stupid.” Hushing my lips for me. We made out that night and I dropped her back off and went home as well.
That week in school I got a snap from Connor. It was during lunch and I clicked on it. I saw the five words that couldn’t make me happier: “I know what you did.” I replied with, “What? What did I do now?” He said, “you hooked up with Liz.” I left him on open and went about my day. I then saw him in the parking lot after school near my car. He came up to me and screamed in my face: “SO YOU THINK YOU CAN JUST STEAL MY GIRL WITHOUT ME DOING ANYTHING?” I laughed right in his face and said, “Well, she isn’t with you anymore now, is she?” He then yelled: “Well, you think you’re just going to go about your day or something?” I said laughing, “Yeah, I was planning on going to Liz’s house after school.” He then jumped on top of me pinning me to the ground, socking me right in the jaw multiple times. I tried throwing some back but, he had my hands pinned to my side. He got up and said, “Fuck with her again and you won’t be getting up.” I got up with my nose bleeding and got into my car and went home.
That was 2 years ago and boy have I got my revenge. Let me start by saying I have no regrets about what I did. Everything I had done was for my satisfaction. You see I don’t care who’s life I ruin … as long as I get something out of it. Connor graduated high school with not much going for him. He had a job at a car dealership as a mechanic or something like that and never went to college. I never went to college so I won’t judge but, I had other plans after high school. I wanted to ruin Connor’s life, and I never stopped until I completed that process. It started with pretty small things like when I tried ruining his relationship back in high school. He was always a dick and who better to fuck with then a worthless piece of shit like Connor. I messaged him a couple of months ago saying: “Hey old friend … remember me?” He replied with “Yeah, the kid I beat the shit out of … I remember you.” I knew he would say something like this so, I sent him a picture of myself and his sister I photoshopped to look as if we were together. He replied with, “What the hell are you doing with my sister … she doesn’t date weird fucks like you.” I replied with, “Oh well looks like her type changed?” I was just sitting on my computer laughing my ass off from how gullible this kid was. He then messaged his sister Claire, which I thought he would do. “Are you dating a kid named Alex?” I had hacked into her phone which was pretty easy because I sent her a phishing email that looked like a women’s clothing company that I knew she had an interest in because of her Facebook. She clicked it and it then downloaded a key logger onto her phone which would send anything that was on her phone to me directly. I override it and replied as her saying: “Haha, yeah … me and him just started talking.” Everything that was being sent right now would delete as soon as I exited the software. I then texted him saying, “Claire is one beautiful woman, kind of reminds me of Liz…” He then said, “You know you’re a real dick you know ….” I said, “Haha the one who beat the shit out of their girlfriend in highschool right … I’m the dick.” I then said, “Hey how’s life going for you ... washing people’s cars ….” He replied with “Fuck you man … go do something with your time.” I ended the conversation with “Ok bud, I’ll let you know how she is in bed…” Now, this was just the first thing I would do to fuck with Connor’s life. A couple google searches for his name and I now had his address … He was still living with his parents at the time. I then went ahead and waited for him to get done work to order a couple of pizzas to his house and make him pay for them. A couple I mean by ordering 20 pizzas all with extra toppings. That was definitely a pricy delivery. A total of $300 if you want to round up. I called in and said I would pay in cash and my name was Connor; I gave the lady on the phone his address and it was as easy as that. You might be asking why I care so much to fuck with someone’s life … It’s easy, I get joy out of it. You see these were the baby steps to ruin someone’s life.
My next attempt would be going to a personal level. Connor had a laptop at home and I went ahead and hacked it. It was easy knowing how stupid he was. He would fall for anything. So I sent him an email that led him to a link that would automatically download a fake porn movie. He would run the download and I would then have access to everything on his computer. Everything. I had every username and password of every website he used including bank accounts, emails, videogames, documents, social media, and much more. I also could see what he was doing by his webcam which he never turned off. He also had a new girlfriend at the time and her name was Jessica or Jess for short. I planned on ruining their relationship too. One night I logged into one of his bank accounts to see what his balance was … It was $1,243.50. So I went ahead and requested a withdrawal to a website that would transfer it into bitcoin. I requested $500 to see if it would work without causing any attention. The transfer went through and I now had $500 in bitcoin. I went ahead and logged out and disconnected my VPN. I also knew Connors social because he had everything saved on his laptop like his passport, birth certificate, and social security. The next morning I drove over to his house and waiting for him to leave for the morning. I watched him get into his car from a street over and pull out of his driveway. He then sped off to the local bank, I proceeded to follow. I guess he found out $500 had been withdrawn from his account. After he was done in the bank he drove to Dunkin donuts. I then thought of an idea as he was inside. I got out of my car in the same parking lot and went over to his car and took my pocket knife out. I flipped it open and sliced his back tire open. I quickly got back in my car which was parked on the other side of the parking lot and waited for him to come out. He was pissed. I could tell because he just stood there and looked around trying to find the person who had done it. I sat in my car looking at him just snickering to myself. I was getting so much joy from watching him in anger. He took his phone out and called someone. He got back in his car and just sat there. I then saw another car pull in the parking lot about 15 minutes later. It was Jess. She pulled in and parked next to Connor’s car. He got out and sat in the front seat of Jessica’s car. I could care less now to watch so I went out of the back entrance and went back home.
I went onto my computer when I got home to open the software to view Connor’s laptop. I had a feeling that the bank would have told him to look for spyware on his computer when he got home so I made sure to get on before he could. I went ahead and deleted every traceable script that was linking the laptop to the RAT. I had scripted another code to perform as a startup manager which looked like windows software. It wouldn’t be picked up by antivirus so I just copied the RAT onto my new script and loaded onto his laptop remotely. I then went ahead and logged back onto his bank account and it was frozen. I wasn’t surprised. I thought they would have done something like this. I had a backup plan though. I went ahead and logged into his iCloud with his username and password which was conveniently saved from google. I searched for “Wheres my iPhone” and found where Connor was. I saw that he was at some apartment complex not far from me so I left my house and went there. It was dark out at this point and he was inside Jessica’s apartment. I parked my car and got out to search for his car. I took my jacket with me and wrapped it around my hand. I found his shitty old Honda just sitting there with a popped tire still. I took my knife which had a glass breaker and put it right against his window. It then cracked and I hit that window as hard as I could with my hand wrapped in my jacket. It broke and glass was everywhere. His car alarm was going off at this point so I had to do what I did next very fast. I looked inside his glove compartment and found his registration and insurance papers. I stuffed them in my pockets and looked through the center console. I found his wallet and a couple of condoms. I took his wallet and got the hell out of there. I sped out of the apartment complex and went back home fast, hoping no cops would see me.
I got back inside my house and looked inside Connor’s wallet. It had about $40 in cash and a little baggie of weed. There were credit cards in there as well. I had a perfect idea. I went onto a proxy and searched for the same bitcoin website I had recently been on. I went ahead and bought approximately $4,500 worth in bitcoin from every single credit card Connor had. I knew that this would destroy his credit score. I knew he wouldn’t be able to get an apartment with bad credit but, he was still living with his mom anyways. I now had extra resources to destroy Connor’s life. I knew that Connor wouldn’t be able to fix that broken window and most definitely wouldn’t be able to drive to work now because all of his papers to legally drive were now in my possession including his driver’s license. He had no money. I needed to move on with my next step to remove Jess from the equation.
I need to find a flaw in their relationship or something to exploit. I went ahead and completed my research on Jessica. Before I go on, I need to mention that Connor had now pulled the police into this. The bank and the police were now going to try and find out who had been messing with him. They won’t be able to find a link between the two. I know this for sure. Although knowing the police are involved it just made this game more fun. I like the attention that I am causing. Let me get back to what I had found on Jessica. What do you know? She was fucking with another dude. How do I know this you might ask? Well, I went ahead and looked around her Facebook and Instagram followers looking at mostly male followers. I ran a program that looked through her direct messages and found an account of another guy in the area. It looks like they went to the same high school. I looked through the messages and they were all flirts back and forth and she finally told him to message her on Snapchat. I, unfortunately, do not have access at this moment to look into her Snapchat messages but this is enough for now. I went ahead and took some screenshots of the messages and spoofed a text message to her saying “Looks like you got a little problem here don’t you?” Attaching the screenshots. She replied saying, “Who are you??? What do you want??” I simply replied back with “Oh nothing much, just pick who you want to keep … Connor is a dick anyway.” She replied, “You have no business in this … how did you even get into my messages?” I then said, “Don’t worry about it Jess, just tell Connor you guys aren’t working out anymore… and you won’t hear from me again.” A simple blackmail is all it took.
Guess he wasn’t really worth it. Never knew how to treat a woman right anyways. Now that Jess was out of the equation I could go ahead and proceed with ruining his life. I went ahead and called into his work. A lady picked up “Hello, [Name of car dealership] this is Lisa speaking, How may I help you?” I went ahead and said, “Ah yes, I recently had my car worked on here and I would like to make a complaint against one of your workers…” She replied with “Ok sir, and do you know the name of the employee?” I said, “Yes I do, Connor [last name]. I saw a scratch on the back of my car which looked like a key or something pulled the paint off. I saw this as soon as I got home from getting my car maintained on.” She said, “Ok sir, I will go ahead and mark down your complaint and we will handle it accordingly… if you would like you could come back so we can get more info from you and we could have someone take a look at the damage?’ I said, “No that won’t be necessary after what you guys have already done, thanks.” I then hung up the phone. I know that this will most definitely get him fired.
I called him a couple of days after this with a masked voice from software that changed my voice. He picked up and I said, “How’s life been? … Shitty let me guess.” He replied with “Can I ask who the fuck is calling? And why do you care how my life’s been?” I said “Maybe this would help … you missing that $4,500? … Lifes a bitch isn’t it.” He said, “You’re going to be arrested for stealing that money .. the police are looking into it.” I said “Oh, Connor I already know that … I’m three steps ahead of them already. I mean I guess Jess doesn’t want to date poor guys huh?” He said, “How the hell do you even know me … what do you want from me?” I said, “Connor go outside there’s a package for you and maybe a couple of your answers will be in there.” I hung up. Before calling him I made sure that a package with nothing except a USB was in there. It was meant to be plugged in and it would be erased within 1 hour of opening the contents … the contents were a txt file with the title of README.txt. It wasn’t a virus or anything it was just a document meant to be read. Once opened it would have a paragraph saying:
Hello Connor, the man that you were just speaking with knows everything about you and will not hurt you. You are playing the game of life. Its simple. You are a pawn in my game. I pick and choose what you do and how you do it. You may not see it but, everything that has been going on in your life the last couple of months has been of my choosing. I’ve been in the process of taking little bits of your life away. One by one. You see it all started back in high school when I took your little girlfriend away. I made her think you cheated on her. Easy. My next step would be to take away all of your money. Poof just like magic. All gone. Your credit is down the drain. The second step was to take away your transportation. No way to drive without any money. The broken window doesn’t help either. Or maybe no driver’s license. I then took your love life away. Jessica is no longer in your life. Well, maybe you might just go back to work to make more money …. Wrong you see. You no longer have a job. Don’t bother going in tomorrow because there was a report of you “damaging” a customer’s car. You may be reading this pretty upset because you have no way of fighting back. Well, that’s where I come in. I will give you a chance. In order to stop playing my game, I will send you an address and all you have to do is show up. Sounds easy? I hope so, for your own sake.
P.S: If you bring the police … the game ends differently. Not in your favor.
I was almost finished with Connor. I needed to do one more thing before I send him the address. I was never going to let him have an easy way out, no. I planned to make him go to a park that was at least an hour out of the direction. This would be a diversion away from his house so I could carry out my plan. I had recently bought with “Connors” money from the $4,500 that I converted into bitcoin approximately 4 kilos of crack cocaine. It would ship domestically so it wouldn’t be searched by customs. I then planned on having it shipped to a nearby drop zone which was an abandoned factory outside of town. I then would take this and put it into a backpack without putting my fingerprints on it. I then also had a USB that would boot up into the dark web which had all of Connors’s personal info like it was his. I also made the password his most commonly used password for the USB. This would link directly back to Connors’s local IP address which I had set onto the USB. I also remotely bought the drugs with Connors’s laptop. My plan here would be to send in an anonymous tip from a payphone to the local police station that there was a large package of crack cocaine shipped to Connors’s address. I also planted the baggie of weed which had Connors fingerprints on them in the back porch of his house. This would give the police probable cause to search the house for drugs. I would assume that they would have already brought a warrant but, just in case I had done that for precautionary reasons. This all would happen tonight. This is when I would successfully ruin Connor’s life. I would send him to prison for years. He would be sentenced with multiple felonies of drug possession and intent to sell. The large quantity that he would be possessing would give him no parol either.
I had the vendor on the dark web pack baggies of grams pre-bagged and one large quantity as well. This would give him the charge of intent to sell as well. The investigation would come down to that he purchased them from his laptop with his credit cards. Nothing would be traced back to me. I made sure of this because I had corrupted all of my hard drives back at home by microwaving them. There was no personal connection to Connor with me. So, I would not be looked into. I was just a kid from his high school with a thousand other students. I had no connection to anyone in his family either. I went ahead and sent him the name of the park through a random phone number I generated and said, “Connor you have 90 minutes to be here, or the game continues.” I was outside his house a street over waiting for him to leave. I saw him leave which was around 12:30 am and everyone was asleep in his house. I set a timer on my phone for an hour which was my time to plant everything and get out before Connor was home. I then went to his back porch and planted the baggie of weed at his bedroom window. He was stupid enough to leave his window open and I opened it and went inside his room. I had gloves on at this point before I left my car. I dropped the backpack inside his closet and plugged in the USB that I had prepared into his laptop which was sitting on his desk. I then left through his window locking it before stepping out. I made sure the weed was sitting nicely on the outside of his window. I then walked back to my car. I checked the timer on my phone and it was at 35 minutes. I knew he would be at the park before the timer was up. I went to a closed parking lot that I scoped out before planting the evidence which had a payphone. I called in and said, “392 [Street] there is a large number of drugs which is owned by Connor [last name]. I am sending this tip in and would like to keep it anonymous for my safety.” I hung up and left the parking lot immediately. On my way back home I got a text from Connor replying with “I’m here … what do you want me to do to end this stupid game?” I replied with “It easy … take your phone and throw it into the lake … You will receive your money back after this last task is done.” He said, “How do I know you’re going to follow through on your end?” I said, “If you don’t do it, you don’t get your money …you are a player of my game remember, you follow my rules and you can win.” I then sent another message saying, “Tomorrow check the balance of your bank, and all the money will be back where it rightfully belongs. Goodbye now.” This would be the last step in covering up everything I had messaged him. He is just playing every card I told him without even knowing. I then called the phone 5 minutes later to see if it connected me through. I called and it said, “The phone number you’ve dialed is no longer in service … please call back later.” My plan was now complete and Connor will be arrested within the hour. I got home and went to sleep without a problem. I woke up the next morning and turned the news on. The headline was “Breaking News: Man in local [county] was arrested last night for drug trafficking.” This was music to my ears hearing the lady speak about the details of the arrest and hearing her say Connor’s name. She said it like he was some criminal and boy did I love that. I looked up the details of the arrest on google and clicked on the first link. [Connor ****** arrested last night for drug traffiking] I saw his mug shot and it said under it that he could be sentenced up to 25 years and up to $20,000 in fines for intent to sell crack cocaine. This was the end of Connor’s free life. He was now a convicted felon and would never have his original life back. My game was now completed and he was the pawn to complete it.
Chapter 2

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How To Transfer Bitcoin From Paxful to another wallet ... How To Send Bitcoin Wallet to Wallet Transfer - YouTube Transfer Bitcoin from one wallet to another - Beginners ... How To Extract Bitcoin From A Paper Wallet - YouTube How To Withdraw Bitcoin From Cash App To A Different Wallet

Step 2. Copy the folders that contain the blockchain. Copy the ‘blocks’ and the ‘chainstate’ folders to a portable device (USB stick, DVD, Hard-drive). Step 3. Update the other computer. Connect the portable device to the computer you want to copy the blockchain to. Locate the same folder and copy & paste the the 2 folders in. After installing the bitcoin client (Qt) a friend got interested as well. He doesn't have as fast an internet connection, though, so I thought of burning some DVDs with the blockchains for him to have. I saw this question on how to transfer blockchain from PC to Mac and the solution was to copy the whole "Bitcoin" folder. However, that folder ... I have about 100 litecoins in my wallet, so this is pretty important to me. How can I move my wallet from my old computer to my new one (both Macs)? I have the Litecoin-Qt installed on my new Mac and it has already finished synching. Please help! EDIT: Would it be easier to send the Litecoins from my old wallet to my new one? Start the wallet software in offline mode to create the parent private and public keys. Copy the parent public key to removable media. (Online) Install the wallet software on another device, this one connected to the Internet, and import the parent public key from the removable media. It may be a USB drive, CD, another computer or your private home cloud storage. You may also copy it to a cloud storage such as Mega or Dropbox but make sure it's encrypted. To restore the backup, simply copy your backed up wallet.dat over an existing one in the bitcoin data location.

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How To Transfer Bitcoin From Paxful to another wallet ...

Send bitcoins step-by-step Paxful offers a wallet service for Bitcoin. One of the features of this service is to send bitcoins to both internal and external ... Hello friends, Heard are all video tutorial about c-cex cryptocurrency/virtual currency exchange in our channel. C-cex.com tutorial videos. Link below. (1). How to transfer bitcoin to c-cex https ... In this easy to follow tutorial you will learn how to transfer your Bitcoin from one wallet to another. This example shows a transfer from a Coinbase wallet ... Spoiler alert: sending Bitcoin to someone else's wallet is more expensive than sending Litecoin, and it takes much longer, too. In this tutorial, I will comp... Simple tutorial that shows how to import Bitcoin or Bitcoin Cash into your BTC.com wallet. BTC.com is one of the most popular cryptocurrency wallets for Bitc...

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