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Date: Sat, 23 Aug 2025 10:35:58 -0700 (PDT)
From: jeremy <jeremy.l.rubin@gmail.com>
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Message-Id: <bc9ff794-b11e-47bc-8840-55b2bae22cf0n@googlegroups.com>
Subject: [bitcoindev] [BIP Proposal] OP_TWEAKADD
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Hi all,
I've made a draft BIP writeup of an (often discussed) simple opcode,
OP_TWEAKADD, deployable as an OP_SUCCESSx upgrade.
https://github.com/bitcoin/bips/pull/1944
This opcode is relatively simple. The main design choices are:
1) Verify v.s. Push semantics -- Push, for succinctness on-chain
2) Argument order -- Key on top, for tweak in witness
3) Plain tweak or something else -- Plain tweak, if hashing is desirable
the user can do it. The most flexible is to do a plain tweak. Future work
could add TapTree opcodes to construct taproot tweaks.
Feedback and discussion are welcome.
Best,
Jeremy
[^1] OP_SHA256 in these example prevents key-cancellation.
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<div>Hi all,</div><div><br /></div><div>I've made a draft BIP writeup of an=
(often discussed) simple opcode, OP_TWEAKADD, deployable as an OP_SUCCESSx=
upgrade.</div><div><br /></div>https://github.com/bitcoin/bips/pull/1944<d=
iv><br /></div><div>This opcode is relatively simple. The main design choic=
es are:</div><div><br /></div><div>1) Verify v.s. Push semantics -- Push, f=
or succinctness on-chain</div><div>2) Argument order -- Key on top, for twe=
ak in witness</div><div>3) Plain tweak or something else -- Plain tweak, if=
hashing is desirable the user can do it. The most flexible is to do a plai=
n tweak. Future work could add TapTree opcodes to construct taproot tweaks.=
</div><div><div><br /></div><div>Feedback and discussion are welcome.<br />=
</div><div><br /></div><div>Best,</div><div><br /></div><div>Jeremy</div><d=
iv><br /></div><div><div>[^1] OP_SHA256 in these example prevents key-cance=
llation.</div></div></div>
<p></p>
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