Difference between revisions of "Manual payout"

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== Warning ==
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== Overview ==
  
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In this process you will copy and paste your private keys from the Bisq software into a web browser. As a precaution it is advised you remove all of your funds from this wallet before starting this procedure.
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Funds for a Bisq trade are locked in a 2-of-2 multisig that is controlled only by the two parties involved.
 +
Bisq normally does all the work to sign and publish the payout at trade completion.
 +
However sometimes a trade can fail due to unforseen circumstances, leaving the funds stranded in the 2-of-2 multisig.
 +
When this happens, a Manual Payout may be necessary.
  
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== Precautions ==
 
  
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This method is only necessary in extreme occasions where one of the traders may not be available. Therefore it is important to make sure that the person who constructs the transaction does not defraud the other signers.
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== Using Bisq's Manual Payout tool ==
 +
The emergency payout tool is in Bisq, if you do a CTRL-G it will open.   
  
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== What you need ==
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The purpose of the tool is to allow owners of a 2of2 multisig to issue a transaction which pays out the funds to their addresses.  The tool is designed to be used in collaboration with mediators but
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it could conceivably be used by the multisig key holders alone.
  
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In this document you use open source tools (aside from Bisq) to create, sign and broadcast transactions of funds locked in multisigs.
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The tool operates in 4 steps:  
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To spend out of a multisig, two things are needed:
 
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* a redeem script
 
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* enough private keys to meet the minimum multisig threshold. You will use the string in "priv WIF=" instead of "priv HEX=".
 
  
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# Fill input information;
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# Import/export details to trade participants;
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# Sign using each holder's private key;
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# Build and broadcast the payout.
  
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Bisq does not provide the Redeem Script for the multisig, but we can recreate it with all the public keys involved in the multisig.
 
  
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Tools you need:
 
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* Bisq software
 
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* [http://explorerzydxu5ecjrkwceayqybizmpjjznk5izmitf2modhcusuqlid.onion Blockstream's block explorer]
 
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* [http://4zpinp6gdkjfplhk.onion Coinbin web wallet]
 
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* [https://www.torproject.org/ Tor browser]
 
  
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== 1. Get the private keys ==
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=== Fill in inputs ===
  
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Get access to your Bisq wallet's private key by pressing "Ctrl + j" or "alt +j" or "cmd + j".
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Input information can be either filled in manually using information from the Bisq trade's Json contract, or for ease of use the same information can be imported from the Mediation ticket.
  
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Check “Include private keys” and click COPY TO CLIPBOARD. Copy, paste and save that information in a bisqWallet.txt file.
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* If filling in manually, all fields on the "Inputs" tab must be entered.
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* If importing from Mediation, choose the Import menu option then pick your mediation ticket from the drop down list and press "Import from mediation ticket".
  
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== 2. Get the multisg public keys ==
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One important thing which the tool prompts you for is the "amountInMultisig" field. This value is not known in Bisq, so the user (or Mediator) has to look it up on a Blockchain explorer and enter it completely accurately into the tool.  If it is incorrect in any way the resultant transaction will fail.  (Reason for this is that Segwit includes the amount as part of the signature inputs).
  
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Each trader involved can get their own and the other trader's public keys in their trade JSON contract. Find your trade under PORTFOLIO. Click the little 'i' icon next to the trade ID and at the bottom click on VIEW CONTRACT IN JSON FORMAT. At the end you will your and the other trader's public keys here:
 
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<nowiki>
 
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BuyerMultiSigPubKeyHex:
 
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SellerMultiSigPubKeyHex:
 
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</nowiki>
 
  
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=== Import/Export to trade participants ===
  
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'''Legacy protocol'''
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Once accurate input information has been entered, the same information needs to be passed to both owners of the multisig keys (the two traders).  This is what the "Export" menu item is for.  It translates the input field data into a code which can be DM'd or emailed to the participants, which they can enter via the "Import" menu (& "Import from String" option). 
  
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If resolving a trade with the old protocol that involved a 2 out of 3 multisig, a third public key belonging to the arbitrator is necessary. The arbitrator can get this public key by following the steps above and search in their own bisqWallet.txt file for it. They can find it by looking for the public key for their Arbitrator address. It is the one in the line with "context=ARBITRATOR".
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The important thing is that each participant have EXACTLY the same information entered into the Inputs section of the tool. If there is any discrepancy between the inputs that each participant signs, then the transaction will be invalid.
  
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An alternative way to get the arbitrator's public key is to look for it in the blockchain. This can be done if at least one of the traders paid the trading fees in BTC.
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Note that if the two traders have access to the mediation ticket they can Import from the ticket themselves.  But it is generally best for Mediator to Export their filled in fields to both traders (via DM).
  
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By tracking the BTC trading fee you can find the cluster of other trades that arbitrator was involved in. Then you need to find to Payout transactions - spending from a 2 out of 3 multisig. In these transactions will be able to find 3 revealed public keys for each trade. The one that is present in both trades is the arbitrator's.
 
  
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== 3. Get the payout addresses ==
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=== Sign ===
  
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At the end of the JSON contract file you can also find the intended payout address for each trader:
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Both participants have to sign the inputs.  This is done from the Sign menu, for convenience there is a "Locate key in wallet" button which will scan the user's wallet for a key which matches the inputs.  "Generate signature" will sign the inputs using the key at the top of the screen. Users could alternatively choose to locate the key themselves, and paste it into the "privateKeyHex" field before doing "Generate signature".
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  <nowiki>
 
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makerPayoutAddressString:
 
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takerPayoutAddressString:</nowiki>
 
  
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== 4. Recreate the Redeem script ==
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Once the signature has been generated each participant should send it to the person who will build and broadcast the transaction (usually the Mediator).
  
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For all the web interactions use the Tor browser. Go to the [http://4zpinp6gdkjfplhk.onion Coinbin web wallet]:
 
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* at the top click “New” and from the dropdown menu choose “MultiSig Address”
 
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* paste in the three public keys in the following order
 
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** Arbitrator
 
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** BuyerMultiSigPubKeyHex
 
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** SellerMultiSigPubKeyHex
 
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* click submit and you should see an address and a Redeem Script. Make sure the address matches the multisig address for the trade. If not try to change the order of the public keys.
 
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* Copy and save the Redeem Script.
 
  
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== 5. Create the transaction ==
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=== Build & Broadcast ===
  
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Next click, once again, “New” at the top, but this time choose “Transaction” from the dropdown menu.
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Once both signatures have been provided, they can be pasted into the Build screen at which time the "Build" button at the bottom of that screen should be pressed. It will generate the TxID and transaction hex into the text area. The transaction hex can be verified using your own tools* or simply broadcast to the network using the "Broadcast" button (or alternatively send it yourself using your Bitcoin node).  
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* Paste the Redeem Script in the text field at the top and click “Load”. It should take a few seconds and then return the value locked in the multisig.
 
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* For the first input fill in an address from **makerPayoutAddressString** and the respective trade amount
 
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* add a new output by clicking the “+” sign next to the amount field. For this second output paste the address that belongs to takerPayoutAddressString and the respective trade amount
 
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* click submit. You should now have an encoded transaction string. Copy and save it.
 
  
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== 6. Verify the transactions ==
 
  
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Click “Verify” at the top and paste the encoded string you got from the previous step. Verify all is correct before moving to the next step.
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* NB: "https://bitaps.com/broadcast" has a "Preview" feature that tests if the transaction is acceptable to the mempool before actually sending it. Any errors in the transaction will be listed, or if it is good it will say "Test mempool transaction accepted" and give the option to broadcast it at that point.
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== 7. Sign the transaction ==
 
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Next click “Sign” at the top of the page and paste your WIF private key you got on step 1 on the “Private key” text field and the encoded transaction in the text field bellow.
 
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To find the private key, search your bisqWallet.txt file for the value of the BuyerMultiSigPubKeyHex (or SellerMultiSigPubKeyHex if you're the seller), which you got on step 2. The private key beginning with "priv WIF=" is written just after the search result. Ensure that the pasted private key is just the part after the "priv WIF=".
 
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Then click “Submit”. You should get a new encoded transaction string. Copy and save it and share it with the other parties of the multisig so they can sign and broadcast it.
 
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== 8. Second signature and broadcast ==
 
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The second signer should click “Verify” at the top of the Coinbin website and paste the encoded string the previous signer shared with you. If you're ok with it, click “Sign” at the top of the page and paste your WIF private key you got on step 1 on the “Private key” text field and the encoded transaction shared with you in the text field bellow. Then click “Submit”. You should  get a new encoded transaction string. Copy and save it.
 
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You can verify the transaction once again before broadcasting.
 
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If everything is correct, click “Broadcast” at the top of the page, paste the encoded transaction string you got after you signed the transaction and click “Submit”.
 
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After all is done, delete the bisqWallet.txt file which you created on step 1.
 

Latest revision as of 22:04, 11 November 2023

Overview

Funds for a Bisq trade are locked in a 2-of-2 multisig that is controlled only by the two parties involved. Bisq normally does all the work to sign and publish the payout at trade completion. However sometimes a trade can fail due to unforseen circumstances, leaving the funds stranded in the 2-of-2 multisig. When this happens, a Manual Payout may be necessary.


Using Bisq's Manual Payout tool

The emergency payout tool is in Bisq, if you do a CTRL-G it will open.

The purpose of the tool is to allow owners of a 2of2 multisig to issue a transaction which pays out the funds to their addresses. The tool is designed to be used in collaboration with mediators but it could conceivably be used by the multisig key holders alone.

The tool operates in 4 steps:

  1. Fill input information;
  2. Import/export details to trade participants;
  3. Sign using each holder's private key;
  4. Build and broadcast the payout.


Fill in inputs

Input information can be either filled in manually using information from the Bisq trade's Json contract, or for ease of use the same information can be imported from the Mediation ticket.

  • If filling in manually, all fields on the "Inputs" tab must be entered.
  • If importing from Mediation, choose the Import menu option then pick your mediation ticket from the drop down list and press "Import from mediation ticket".

One important thing which the tool prompts you for is the "amountInMultisig" field. This value is not known in Bisq, so the user (or Mediator) has to look it up on a Blockchain explorer and enter it completely accurately into the tool. If it is incorrect in any way the resultant transaction will fail. (Reason for this is that Segwit includes the amount as part of the signature inputs).


Import/Export to trade participants

Once accurate input information has been entered, the same information needs to be passed to both owners of the multisig keys (the two traders). This is what the "Export" menu item is for. It translates the input field data into a code which can be DM'd or emailed to the participants, which they can enter via the "Import" menu (& "Import from String" option).

The important thing is that each participant have EXACTLY the same information entered into the Inputs section of the tool. If there is any discrepancy between the inputs that each participant signs, then the transaction will be invalid.

Note that if the two traders have access to the mediation ticket they can Import from the ticket themselves. But it is generally best for Mediator to Export their filled in fields to both traders (via DM).


Sign

Both participants have to sign the inputs. This is done from the Sign menu, for convenience there is a "Locate key in wallet" button which will scan the user's wallet for a key which matches the inputs. "Generate signature" will sign the inputs using the key at the top of the screen. Users could alternatively choose to locate the key themselves, and paste it into the "privateKeyHex" field before doing "Generate signature".

Once the signature has been generated each participant should send it to the person who will build and broadcast the transaction (usually the Mediator).


Build & Broadcast

Once both signatures have been provided, they can be pasted into the Build screen at which time the "Build" button at the bottom of that screen should be pressed. It will generate the TxID and transaction hex into the text area. The transaction hex can be verified using your own tools* or simply broadcast to the network using the "Broadcast" button (or alternatively send it yourself using your Bitcoin node).


  • NB: "https://bitaps.com/broadcast" has a "Preview" feature that tests if the transaction is acceptable to the mempool before actually sending it. Any errors in the transaction will be listed, or if it is good it will say "Test mempool transaction accepted" and give the option to broadcast it at that point.
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