Tapscript

Tapscript is the scripting language used for taproot script-path spends.

It shares most operations with legacy and segwit Bitcoin Script but has a few differences:

• OP_CHECKMULTISIG and OP_CHECKMULTISIGVERIFY are replaced by a OP_CHECKSIGADD opcode.

• Many opcodes are redefined to be OP_SUCCESS opcodes that unconditionally render the entire script valid to simplify soft fork upgrades.

• Signature hashes are calculated differently than in legacy script or BIP143 v0 segwit.

Primary code and documentation

• bip-tapscript

Optech newsletter and website mentions

• 2019-12-28 2019 year-in-review: taproot and tapscript
• 2019-12-04 Discussion about position commitments using signature-checking opcodes
• 2019-10-29 Bitcoin Optech schnorr/taproot workshop
• 2019-10-23 Announcement of structured taproot review (including tapscript)
• 2019-10-16 Update on changes to schnorr, taproot, and tapscript
• 2019-09-25 Tapscript resource limits
• 2019-07-10 BIP322 signmessage forward compatibility
• 2019-06-14 Executive briefing: Taproot and Tapscript
• 2019-05-14 Overview of Taproot and Tapscript
• 2019-05-14 Extended summary of bip-taproot and bip-tapscript

See also

• Taproot

  
  

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