No Bull is a live video released by AC/DC in November 1996, filmed on Super 16mm at Madrid's Plaza de Toros de Las Ventas on 10 July 1996 during the Ballbreaker World Tour. It was directed by David Ma
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d750615aa8ceb4770421d4f938cbf55e0f03752c2e44a40a24f0de90de54eb4. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12ae11e3-533b-4e5f-a670-98ee634e4072.json and https://artists.proofprofile.net/proofs/artist/12ae11e3-533b-4e5f-a670-98ee634e4072.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).