Marc Ribot (; born May 21, 1954) is an American guitarist and composer. His work has touched on many styles, including no wave, free jazz, rock, and Cuban music. Ribot is also known for collaborating
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d3027f9adc19c5fee4da919de6403b3a0436a43d6fa5cf2ee6a5d2802c97b5. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be35dae6-658f-46a9-bfbe-0d91807d6e29.json and https://artists.proofprofile.net/proofs/artist/be35dae6-658f-46a9-bfbe-0d91807d6e29.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.