Big Fella is a 1937 British musical drama film directed by J. Elder Wills and starring Paul Robeson, Elisabeth Welch and Roy Emerton. It is loosely based on the 1929 novel Banjo by Harlem Renaissance
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 0x26121a763c92548f7b0839fd2d94dc9120b0b14f9ac4cc8589e2f8f807ee4ed0. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3175355-0589-4ac4-a513-c4dea037208c.json and https://artists.proofprofile.net/proofs/artist/a3175355-0589-4ac4-a513-c4dea037208c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).