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Reformat the check list for sender

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nicolas.dorier 2020-06-19 13:16:16 +09:00
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1 changed files with 8 additions and 7 deletions
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@ -260,13 +260,14 @@ The sender should check the payjoin proposal before signing it to prevent a mali
** Verify that all of sender's inputs from the original PSBT are in the proposal.
* For each outputs in the proposal:
** Verify that no keypaths is in the PSBT output
** If it is one of the sender's output
*** If that's the [[#fee-output|fee ouptut]]:
**** The amount that was substracted from the output's value is less or equal to <code>maxadditionalfeecontribution</code>. Let's call this amount <code>actual contribution</code>.
**** Make sure the actual contribution is only paying fee: The <code>actual contribution</code> is less or equals to the difference of absolute fee between the payjoin proposal and the original PSBT.
**** Make sure the actual contribution is only paying for fee incurred by additional inputs: <code>actual contribution</code> is less or equals to <code>originalPSBTFeeRate * vsize(sender_input_type) * (count(original_psbt_inputs) - count(payjoin_proposal_inputs))</code>. (see [[#fee-output|Fee output]] section)
*** If it is not the fee output:
**** Make sure the output's value did not changed.
** If the output is the [[#fee-output|fee ouptut]]:
*** The amount that was substracted from the output's value is less or equal to <code>maxadditionalfeecontribution</code>. Let's call this amount <code>actual contribution</code>.
*** Make sure the actual contribution is only paying fee: The <code>actual contribution</code> is less or equals to the difference of absolute fee between the payjoin proposal and the original PSBT.
*** Make sure the actual contribution is only paying for fee incurred by additional inputs: <code>actual contribution</code> is less or equals to <code>originalPSBTFeeRate * vsize(sender_input_type) * (count(original_psbt_inputs) - count(payjoin_proposal_inputs))</code>. (see [[#fee-output|Fee output]] section)
** If the output is the payment output and <code>disableoutputsubstitution=</code> is <code>false</code or not specified
*** Do not make any check
** Else
*** Make sure the output's value did not changed.
** Verify that all sender's outputs (ie, all outputs except the output actually paid to the receiver) from the original PSBT are in the proposal.
* Once the proposal is signed, if <code>minfeerate</code> was specified, check that the fee rate of the payjoin transaction is not less than this value.