In Pieter Wuille’s current reply [Why did BIP-342 replace CHECKMULTISIG with a new opcode], BIP-342’s
deliberate minimization of semantic modifications was attributed to the
expectation that “these might all the time be launched with later softforks
that redefine OP_SUCCESSes.”
I am curious in regards to the granularity of this reservation:
- Had been particular opcode candidates (e.g., CHECKSIGFROMSTACK, CAT, TXHASH)
already on the radar when OP_SUCCESS positions have been allotted, or was
the allocation purely summary — “reserve house for unknown future use”? - Was there dialogue about courses of additives (introspection opcodes,
signature variants, hash operations) that may or would not be acceptable
candidates for OP_SUCCESS redefinition vs. requiring a deeper softfork? - Are there design properties an opcode SHOULD should be a clear
OP_SUCCESS redefinition (vs. requiring extra invasive consensus modifications)?
I ask as a result of the activation-path mechanics matter for a way neighborhood
discussions about future opcodes ought to be framed: is the dialog
“which opcode” or additionally “which opcode reservation slot.”
