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Script (uppercase S, additionally Bitcoin Script) is the scripting language utilized in Bitcoin. Its packages are referred to as “scripts” (lowercase s), usually with an adjective primarily based on the situation of the script in a transaction (output script, enter script, redeem script, witness script, leaf script).
Leaf script is a script revealed as a part of a Taproot (SegWit v1) script path spend (see BIP341).
Tapscript is a variant of Script utilized in leaf scripts with a leaf model of 0xc0 (see BIP342). It makes some important modifications to beforehand used Script, resembling switching from ECDSA to Schnorr signatures, changing OP_CHECKMULTISIG(VERIFY) with OP_CHECKSIGADD and introducing OP_SUCCESS opcodes for higher upgradeability. Tapscript scripts are sometimes referred to as “tapscripts”.
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