Cointelegraph Research published the fifth installment of its Bitcoin covenants series, focusing on MATT and the proposed OP_CHECKCONTRACTVERIFY opcode defined in BIP 443. The MATT framework embeds contract state data in Taproot output keys through cryptographic tweaks, then uses OP_CCV to verify that the state was correctly updated when the output is spent. This mechanism could support vaults, payment pools, transferable discreet log contracts and optimistic smart contracts. Originally proposed by Salvatore Ingala in November 2022, MATT also aims to make fraud proofs more efficient when paired with OP_CAT while limiting the computational burden placed on mainnet nodes. By late 2026, however, no covenant proposal has been activated on Bitcoin, and developer consensus remains the main obstacle to implementation.
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