Safe Bitcoin Escrow Service — Free and Encrypted — Coinsavr

JobsForBitcoin

Work & Get Paid in Bitcoin. With Full Escrow System.
[link]

Buy and sell Bitcoins p2p with fellow Redditors

Buy and sell Bitcoins p2p with fellow Redditors
[link]

100% Unique Tattoo Designs

This subreddit is devoted to putting tallented artists in touch with people looking for an incredible one of a kind tattoo. Turn any idea into a ready to go tattoo, print and bring to any shop. We work with many established tattoo businesses to give exclusive discounts to anyone that brings in art from this community.
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Buy & Sell Everything Online with Bitcoin! Register as a vendor today & set up your online store in less than 5 minutes. Enjoy shopping with ease through the built-in Escrow system.

Buy & Sell Everything Online with Bitcoin! Register as a vendor today & set up your online store in less than 5 minutes. Enjoy shopping with ease through the built-in Escrow system. submitted by ABitcoinAllBot to BitcoinAll [link] [comments]

Bitteam platform acts as a guarantor of transactions (Escrow system): ● Bitcoin (BTC); ● Ethereum (ETH); ● Litecoin (LTC); ● Bitcoin cash (BCH); ● Tether (USDT); ● prism (PZM); ● BitTeamToken (BTT); ● ... Stellar is already connected (XLM). #BitTeam #BTT #tokensale #P2P #exchange #Marketplace #CDC

Bitteam platform acts as a guarantor of transactions (Escrow system): ● Bitcoin (BTC); ● Ethereum (ETH); ● Litecoin (LTC); ● Bitcoin cash (BCH); ● Tether (USDT); ● prism (PZM); ● BitTeamToken (BTT); ● ... Stellar is already connected (XLM). #BitTeam #BTT #tokensale #P2P #exchange #Marketplace #CDC submitted by Liliya_Tishkova to u/Liliya_Tishkova [link] [comments]

Unique Escrow and funding system. /r/Bitcoin

Unique Escrow and funding system. /Bitcoin submitted by cryptoallbot to cryptoall [link] [comments]

Unique Escrow and funding system. /r/Bitcoin

Unique Escrow and funding system. /Bitcoin submitted by ABitcoinAllBot to BitcoinAll [link] [comments]

Giant flaw with the escrow system for selling bitcoin

You have Bitcoin that you want to sell immediately and respond to a buy ad. There is no way to communicate with the buyer before opening the trade, and after opening only the buyer can cancel the trade.
If the buyer is not responding or is simply not capable of paying for the Bitcoin you are stranded and need to start the dispute process.
This is proportionally much more complicated for the seller than it is for the buyer. Anyone could post an ad for buying large volumes of Bitcoin without actually having any money. Since we can't speak to the buyer beforehand we don't even know if they are willing and able to trade the volume requested (which they advertised).
The key take away here is to make it possible to speak to buyers before deciding to open a trade with them and placing bitcoins in escrow. It would eliminate the problem with unresponsive buyers.
The only remedy otherwise would be to leave negative feedback to discourage such behavior, but that impacts both parties which isn't great when the problem could have been avoided by simple pre-purchase communication.
submitted by sz1a to localbitcoins [link] [comments]

Can bitcoin have a built-in escrow system, or it's technically impossible ?

When i decide to buy something with Bitcoins I always stops on 'No Buyer Protection'. When goods are bought using Bitcoins, and the seller doesn’t send the promised goods, nothing can be done to reverse the transaction. I know this problem can be solved using a third party escrow service like ClearCoin, but then, escrow services would assume the role of banks, which would cause Bitcoins to be similar to a more traditional currency.
Is it possible to built inside the program code that run bitcoin an escrow system instead of Peer-to-Peer (or as an option when purchasing) ? Or is it logically impossible to be done ?
submitted by CrazyGentleMan to Bitcoin [link] [comments]

AS more buyers scam the paypal system. Paypal will be abandoned by most merchants. Can a bitcoin escrow payments system replace Paypal. Ie Is Paypal dying a slow death?

AS more buyers scam the paypal system. Paypal will be abandoned by most merchants. Can a bitcoin escrow payments system replace Paypal. Ie Is Paypal dying a slow death? submitted by phanpp to btc [link] [comments]

We work on a P2P marketplace where you can create offers of buying and selling Bitcoins. It is a free service, apart of a withdrawal fee (0.0001 BTC). We plan to add more features to protect users privacy, but now it acts as a basic escrow system. Check it out as we need some love!

submitted by BitcoinAllBot to BitcoinAll [link] [comments]

We work on a P2P marketplace where you can create offers of buying and selling Bitcoins. It is a free service, apart of a withdrawal fee (0.0001 BTC). We plan to add more features to protect users privacy, but now it acts as a basic escrow system. Check it out as we need some love!

submitted by flucto to Bitcoin [link] [comments]

Could jailbreak pledge systems work with a multi sig escrow? /r/Bitcoin

Could jailbreak pledge systems work with a multi sig escrow? /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

'OpenCore Computer' Launches Commercial Hackintosh in Violation of Apple's macOS Licensing Agreement

'OpenCore Computer' Launches Commercial Hackintosh in Violation of Apple's macOS Licensing Agreement submitted by sandiskplayer34 to apple [link] [comments]

does TMP escrow system implement bitcoin's multisig feature?

i had been reading about smart contracts on the bitcoin wiki and came across multisig for transaction arbitration. is that what TMP uses for it's trustless escrow system?
submitted by yessir_123 to themarketplace [link] [comments]

Any simple multi sig escrow system for bitcoin?

I'm thinking of making a site that uses multi sig escrow where the buyeseller can do 2 of 3 multisig and if there's a condition that has to be met like have a tracking number that says something was delivered for the buyer to get the bitoin. does something similar to this already exist?
submitted by clownpenusdotfart to Bitcoin [link] [comments]

AS more buyers scam the paypal system. Paypal will be abandoned by most merchants. Can a bitcoin escrow payments system replace Paypal. Ie Is Paypal dying a slow death?

AS more buyers scam the paypal system. Paypal will be abandoned by most merchants. Can a bitcoin escrow payments system replace Paypal. Ie Is Paypal dying a slow death? submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Crypto-Auctions.com - Free Listings and No Final Sale Fees. Integrated Bitcoin Payments & Escrow System

Crypto-Auctions.com - Free Listings and No Final Sale Fees. Integrated Bitcoin Payments & Escrow System submitted by GlobalDenomination to Bitcoin [link] [comments]

Thoughts on 2 party escrow system? /forum.bitcoin.com

Thoughts on 2 party escrow system? /forum.bitcoin.com submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Bitcoin Discussion • Thoughts on 2 party escrow system?

submitted by btcforumbot to BtcForum [link] [comments]

Article Series - Create a Multisig Bitcoin Escrow System with Bitcore.io and Node.js

Recently I was challenged with creating a fully functional Bitcoin multi-signature escrow system using Node.js. After searching far and wide on Google, I couldn't find any good tutorials, so I decided to write some myself.
Therefore! I am going to write a series of articles for Node.js developers to help create a fully functional multi signature Bitcoin escrow service using the Bitcore.io API. Feel free to follow me, comment and make suggestions.
Part 1 already written here:
http://www.rjmacarthy.com/create-a-multi-signature-2-of-3-address-using-bitcore-and-node-js/
submitted by rjmacarthy to Bitcoin [link] [comments]

Crypto-Auctions - FREE LISTINGS Integrated Escrow system with Bitcoin and Offline GDN Payments

Crypto-Auctions - FREE LISTINGS Integrated Escrow system with Bitcoin and Offline GDN Payments submitted by GlobalDenomination to GlobalDenominationGDN [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]

[ 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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I am the creator of BitcoinDuLiban.org. I am on a mission to educate Lebanese about the importance and usefulness of Bitcoins in their lives. AMA

What is Bitcoin?

Bitcoin (₿) (ticker BTC)is an open source cryptocurrency. It is a decentralized cryptographic currency without a central bank or single administrator in control that can be sent from user to user on the peer-to-peer bitcoin network without the need for 3rd person in between like bank, or payment processor or institution all transaction processing and verification is carried out collectively by the network.
Find out more at http://www.bitcoinduliban.org/

Why Bitcoin is the future?

Bitcoin emerged in 2009 as more economies across the world started losing trust in the current banking model. Institutions that have been around longer than ourselves have changed very little throughout our lifetime. Not only does the lack of trust, and stagnant change of banks allow Bitcoin to thrive, but also the possibility of eliminating inflation. Bitcoin saw the opportunity to take the power out of the institutions and provide a better service, and the people responded. Bitcoin operates universally, meaning for the first time, there is a possibility of a global currency. With truly international currency possibilities for global economic growth, social equality, self-sovereignty is endless.

Why Bitcoin and not others?

It is a very good question, there at the moment of writing over 2000 projects and “coins” that emerged after Bitcoin. Many of them claim to be faster, better and more flexible than Bitcoin however very few have withstood the test of time or delivered their proposed product. The basic fundamentals of Bitcoin’s principle monetary policy are unprecedented, and by now, it is impossible to replicate its level of decentralization or network security, which is powered by a computer network as powerful as almost 12 trillion Intel Core i7 processors. Bitcoin also has the largest social / community strength. I would HIGHLY advise against investing or getting dragged into any project that claims superiority, I have single rule : if it says it's better than Bitcoin then its what we call “scam-coin” you will only get pulled in and lose your bitcoin/usd value causing a lot of pain and sadness . Sit down, read, learn and be patient, you will not miss out on anything over night and if something is rising in price quickly most likely it will crash as fast.

Does bitcoin have an applicable use in daily life or is it only for holding for future gains?

Bitcoin has taken over the cryptocurrency market. It’s the largest and most well-known digital currency today. Many large companies are accepting Bitcoin as a legitimate source of funds, you can use your Bitcoin at but not limited to : KFC, Burger King, Microsoft, AT&T , Expedia, Subway, Twitch, Virgin Galactic and many more just look it up. You can look up merc and services at https://spendabit.co/ So if you are living abroad, you can use your bitcoin just like any other known currency in addition there are Debit cards in collaboration with VISA network offers that are backed by Bitcoin making you able to pay with it anywhere in the world just with a swipe or tap.

As Lebanese in Lebanon, how can I buy or sell bitcoin ?

In Lebanon unfortunately we can not use our banking system to purchase bitcoin, there was a time where rain.bh an UAE based exchange was accepting Lebanese Cards, till it was stopped but give it a try we weren’t able to confirm all cards.
Therefore most common way to buy bitcoin in lebanon is using P2P which is person to person exchange, this can be through an international website such as localbitcoins.com or hodlhodl.com , all you gotta do is find a sell offer initiate transaction with seller , send him his payment using WesterUnion or Moneygram and once the seller receives payment your bitcoins will be released but make sure you use escrow service which ensures safety of your transaction therefore bitcoins you are buying are frozen for the seller and he can not retrieve them unless you fail to pay or run out of time window to pay. Another p2p way is through local bitcoin communities , there are plenty of traders willing to exchange with you however always ask for the reputation of the seller inside a group and never respond to private messages unless it is a confirmed reliable trader just to avoid losing and being scammed. Feel free to find out more about how to buy in Lebanon at http://www.bitcoinduliban.org/

If I have a bank account outside Lebanon, can I use bitcoin to transfer money from Lebanon to my bank account outside?

It is possible to transfer Bitcoin to an international account in the USA or EU for example, you would need to use recognized exchanges such as coinbase.com kraken.com and many others. It would be as simple as sending BTC to your coinbase account, converting to USD and withdrawing it to your account. However you must take few precautions, if you are sending a significant amount of BTC and converting it to USD you will need some kind of proof that these funds are yours otherwise you might get investigated for money laundering. So is it convenient to send ? I do not think so, if you managed to get what we call now in Lebanon “ Fresh USD” it would be much less of a hassle to simply initiate an international transaction.

Why would I want to send Bitcoin to my family or friends in Lebanon ?

This is where I believe BTC can shine for us, you can use exchanges as coinbase,kraken or any prefered place to purchase some bitcoin that can be transferred to your family wallet within minutes. Your family or friends can exchange bitcoin or part that is needed with local traders to LBP at desired exchange rate therefore you are not forced to exchange at rates given by WesterUnion, after which they will be able to do their daily purchases and mitigate inflation rates to some extent. You can send as little as $1 and the transaction costs less than $1 for any amount.

Why is the Bitcoin price so volatile ?

Indeed it can be, sudden swings of 20% both ways are considered normal if you look at daily data, however bitcoin since 2009 had only one trend which is upward, 80% chance is if you bought BTC at any moment in past 2 years is that you are on break even or positive not loss. Feel free to try this exercise by going to https://dcabtc.com/

Should I invest?

NO. Now since we got the short version of this, let me elaborate. By the end of the day it is a new class of an asset, the price is still in the discovery phase and it could cause a lot of pain and sleepless nights if you invest more than you can chew to possibly lose. No one can advice you what to do with your money and how to position them, however i highly encourage to read, educate yourself on money before investing in BTC a good start would be https://bitcoinduliban.org. Please ask more knowledgeable bitcoin users and double check sources , once you feel confident enough that you understand this monetary system you can try dipping your toes with small amounts and build your position from there. Just stay away from quick gains schemes such as “online mining” “cloud mining” and anything that offers 100% returns in a very short time, if it's too good to be true then it's a scam.

Scams, BE AWARE.

Due to our difficult situation we are being targeted by constant advertisement of potential new solutions using “newly developed cryptocurrencies“ , unfortunately such new technology does not exist and they are trying to take advantage of us by promising fake solutions.
Even Bitcoin can not provide you with a solution to your hard worked money being inaccessible in any Lebanese bank.
Here are few typical scam msgs:
submitted by marceldy to lebanon [link] [comments]

How to create and use Multi Sig Bitcoin Wallets ESCROW SYSTEM & XRP PRICE Bitcoin Crach Prévu - ne soyez pas dupés par le BULL TRAP Automatic Escrow with Bitcoin Bitify.com - Buy Online with Bitcoin Using Escrow Bitcoin and Cryptocurrency Escrow service

Bitcoin Escrow Summary. A Bitcoin escrow service is a mediator service that keeps the money for a transaction between strangers in safekeeping until the Bitcoins (or goods) are handed over. There aren’t a lot of reputable escrow services to choose from today. ItBit Escrow is a cryptographic escrow service provided by the NewYork based crypto exchange ItBit. ItBit started operation in 2013 and claims to be the only Bitcoin exchange in the world that has been federally regulated and offers service in all 50 states in the US. A Bitcoin escrow service is one of the most secure ways of dealing with Bitcoin-based transactions where trust is an issue, as the escrow system is set up in such a way that the party that errs forfeits the money in the escrow account to the other party. When a person decides to buy something for BTC, they send the sum to an escrow service, and it is kept in the system until the goods/services are provided by the seller. Once the strangers finish the transaction, BTC frozen in the escrow system is automatically sent to another party. Bitcoin escrow services have the following benefits: EscrowCoin was created to solve the problems which exist in today’s Escrow services around the globe, as none of them support Escrow for cryptocurrency. You can always try the Bitcoin Revolution Review as a starting point. The system’s staking feature was designed to help resolve the problem of transaction fees when using EscrowCoin for Escrow.

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How to create and use Multi Sig Bitcoin Wallets

Bitcoin Escrow Script : It is a website script, that can be helpful to made a bitcoin exchange website powered with bitcoin escrow features. It can be written in any launguage like JAVA, PHP ... Trustatom uses multi-signature bitcoin addresses to provide cheap escrow to anyone with bitcoin. This is the first example of a smart contract, made possible by programmable money. Join the World's Largest Bitcoin marketplace and auction site. Bitify.com - World's most trusted escrow service with up to 30 days buyer protection. Not sure... This short video can blow your mind ! & Finally you can get some interesting ideas about bitcoin business sources! To have a live discussion with crypto experts, fill out this form https://goo.gl ... This is useful if you want more than one person to be required to 'sign off' or 'authorize' any outgoing Bitcoin wallet transaction. This is also a great security measure for your own personal ...

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