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Update size of ECDH share and unify spacing

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Andrew Toth 2024-12-10 19:19:24 -05:00
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commit 8e90f02dc5
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1 changed files with 3 additions and 3 deletions
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@ -17,7 +17,7 @@
===Abstract===
This document proposes additional fields and updated role responsibilities for BIP 370 PSBTv2
This document proposes additional fields and updated role responsibilities for BIP370 PSBTv2
which adds support for sending to silent payments as described in BIP352.
===Copyright===
@ -26,7 +26,7 @@ This BIP is licensed under the 2-clause BSD license.
===Motivation===
Partially Signed Bitcoin Transaction Version 2 as described in BIP 370 is not compatible with sending to silent payments as described in BIP352. In particular, the output script of a silent payment cannot be computed until after all transaction inputs have been added.
Partially Signed Bitcoin Transaction Version 2 as described in BIP370 is not compatible with sending to silent payments as described in BIP352. In particular, the output script of a silent payment cannot be computed until after all transaction inputs have been added.
Also, any inputs that the Signer has the private keys for must be signed with SIGHASH_ALL and all inputs must not have any scriptPubKeys with Segwit version > 1.
Additionally, the silent payment outputs computed by a signer must be verifiable to other entities.
Therefore, new fields and role responsibilities must be added to carry, compute, and verify the silent payment data.
@ -54,7 +54,7 @@ The new global types are defined as follows:
| <tt>PSBT_GLOBAL_SP_ECDH_SHARE = 0x07</tt>
| <tt><33 byte scan key> <36 byte outpoint>*</tt>
| The scan key and a list of outpoints corresponding to the prevouts of the inputs that this ECDH share is for. The outpoints are composed of a 32 byte txid followed by a 32-bit little endian uint.
| <tt><32 byte share></tt>
| <tt><33 byte share></tt>
| An ECDH share for a scan key, followed by a list of outpoints. The ECDH shared is computed with ''a * B_scan'', where ''a'' is the sum of all private keys of the inputs matching the list of outpoints, and ''B_scan'' is the scan key of a recipient.
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