Unlocking Expressivity With OP CAT
summary
OpCat adds a simple concatenate stack elements opcode that, combined with existing checksig mechanics, lets scripts extract signed transaction data to build covenants, vaults and payment-pools. Practical demos include Merkle-tree lookups for giant lookup tables, exhaustive lookup “multiplication” tables, bonded addresses that leak keys on double-spend, and payment pools letting users pick fees. OpCat alone doesn’t enable rebindable Lightning channels—that needs an extra checksig-from-stack style primitive—and the proposal is pitched as low-complexity harm reduction.
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chapters (9)
- 0:00Introduction and Panelist Introductions
- 3:00OpCat and the Power of Covenants
- 5:57The Magic of Covenants in Bitcoin Script
- 8:38Introduction to Covenants in Bitcoin
- 11:36Flexibility in Fee Rates and Vaults
- 14:30The Benefits of CAT in Bitcoin
- 17:11The Design Space of Opcodes in Bitcoin
- 20:10The Excitement of Cat in Bitcoin
- 23:07The Challenges of Expressivity in Programming Languages
