The Frontier

Julian explains BIP 441 introduces Tapscript v2, which re-enables 15 opcodes disabled by Satoshi in 2011. It includes splicing, bitwise logic, arithmetic, and lifts arbitrary stack size and element limits.

Julian notes the new VAR OPS budget in BIP 440 is more restrictive than old limits for Tapscript v2, meaning some previously valid scripts could fail under the new framework.