"Big Sam" is a nickname for: Big Sam (musician), New Orleans trombone player of "Big Sam's Funky Nation" Sam Allardyce (born 1954), English football player and manager Big Sam (American football)
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 0x083731223f068f7a8478567ed07ea4a7f3d0cc7ede142d5e5ba0d7c8b266995d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c76a5ea4-8a32-4048-b01c-ae3b7f4d3a73.json and https://artists.proofprofile.net/proofs/artist/c76a5ea4-8a32-4048-b01c-ae3b7f4d3a73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).