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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