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docs: Document decreasing the output value in RBF transactions.

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Andrew Kozlik 2021-02-25 17:27:21 +01:00 committed by Andrew Kozlik
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docs/common/communication/bitcoin-signing.md
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@ -306,7 +306,10 @@ A replacement transaction in Trezor must satisfy the following requirements:
* All inputs of the original transactions must be inputs of the replacement transation. * All inputs of the original transactions must be inputs of the replacement transation.
* All _external_ outputs of the original transactions must be outputs of the replacement * All _external_ outputs of the original transactions must be outputs of the replacement
transation and none of their output amounts may be decreased. transation.
* The value of an external output may be decreased only if there are no new external
inputs. This should only be used to bump the fee if the original transaction transfers
the entire account balance and there is no other source available to bump the fee.
* The replacement transaction must not increase the amount that the user is spending * The replacement transaction must not increase the amount that the user is spending
on external outputs. on external outputs.
* Original transactions must have the same effective `nLockTime` as the replacement * Original transactions must have the same effective `nLockTime` as the replacement