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BIP 433: Add P2A BIP#1982

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Roasbeef merged 1 commit intobitcoin:masterfrom
instagibbs:2025-09-p2a
Jan 9, 2026
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BIP 433: Add P2A BIP#1982
Roasbeef merged 1 commit intobitcoin:masterfrom
instagibbs:2025-09-p2a

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@instagibbs instagibbs commented Sep 24, 2025

For interoperability with other schemes, it behooves me to write a BIP for this output type. It's already standard to spend in well over half the network.

h/t roasbeef for bothering me about this repeatedly

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jonatack reviewed Sep 25, 2025
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Quick first pass.

bip-0433.mediawiki

====Backward Compatibility====

Creation of P2A outputs has been considered standard since the deployment of Segwit softfork on the network.
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Maybe link here to the SegWit BIP section making them standard.

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@instagibbs instagibbs Oct 7, 2025

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the BIPs aren't standardness BIPs, so I'm not sure that helps.

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@murchandamus murchandamus Dec 8, 2025

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I’m not sure if the segwit BIPs (141–144) mentioned it, but BIP 173 (Bech32) states that “implementations MUST allow the use of any version”. And that recommendation is repeated in BIP 350 (bech32m), which mentions it in the Implementation advice for test vectors.

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Thanks for making this. Nearly done with an implementation for btcsuite.

Roasbeef
Roasbeef reviewed Sep 25, 2025
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Looks pretty good already. I got a bag of nits for you.

bip-0433.mediawiki

====Backward Compatibility====

Creation of P2A outputs has been considered standard since the deployment of Segwit softfork on the network.
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I’m not sure if the segwit BIPs (141–144) mentioned it, but BIP 173 (Bech32) states that “implementations MUST allow the use of any version”. And that recommendation is repeated in BIP 350 (bech32m), which mentions it in the Implementation advice for test vectors.

murchandamus
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Roasbeef commented Dec 9, 2025 •
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This BIP has been assigned number 433!

(can update the readme in the PR to reflect assignment)

@Roasbeef Roasbeef changed the title Add P2A BIP BIP 433: Add P2A BIP Dec 9, 2025
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murchandamus commented Dec 9, 2025

Please add an entry to the table in the README.md for your BIP, add the number to the preamble, and update the “Created” header to 2025-12-08.

@instagibbs instagibbs force-pushed the 2025-09-p2a branch 2 times, most recently from 7ab1a16 to 3afec38 Compare December 9, 2025 16:05
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instagibbs commented Dec 9, 2025

Thanks for the review and number!

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Changes look good to me. ACK ab9bc69

@yyforyongyu yyforyongyu mentioned this pull request Dec 17, 2025
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Roasbeef
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LGTM 🌉

@Roasbeef Roasbeef merged commit 1a75a3d into bitcoin:master Jan 9, 2026
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@theStack theStack mentioned this pull request Jan 11, 2026
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glozow added a commit to bitcoin/bitcoin that referenced this pull request Jan 11, 2026
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Merge #34252: doc: add 433 (Pay to Anchor) to bips.md
abc6a3a 
44b12cd doc: add 433 (Pay to Anchor) to bips.md (Sebastian Falbesoner)

Pull request description:

  See PR bitcoin/bips#1982 (merged recently) and #30352 (first released in v28.0).

ACKs for top commit:
  instagibbs:
    ACK 44b12cd
  glozow:
    ACK 44b12cd

Tree-SHA512: 0389bfd9b57a354ef15eff726783c83969586a73de52d27b6d3b042dba14c1361af29303b6ce42330a841310811a81c5e45b5c7d25e307787f1cfbfd75ab3e62
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@instagibbs @Roasbeef @murchandamus @jonatack