Author: ZmnSCPxj 2019-09-30 23:28:43
Published on: 2019-09-30T23:28:43+00:00
In a message to a mailing list, a user named ZmnSCPxj suggests the creation of a new opcode called `OP_CHECKSIG_WITHOUT_INPUT` as an alternative to `SIGHASH_NOINPUT`. This new opcode would ignore any `SIGHASH` flags present on a signature and instead hash the current transaction without input references to check against the signature. The suggested opcode could be embedded in a Taproot script, which already supports special SCRIPTs that may potentially lose funds for users.ZmnSCPxj also notes that this proposed new opcode would allow for a Decker-Russell-Osuntokun with an internal Taproot point to be a 2-of-2, then have a script `OP_1 OP_CHECKSIG_WITHOUT_INPUT`. Unilateral closes would expose the hidden script, but cooperative closes would use the 2-of-2 directly. The author raises the question of why there isn't more concern about potential abuse of Taproot, considering its support for SCRIPTs that may lead to fund losses.
Updated on: 2023-06-02T20:31:45.107227+00:00