Han Bennink (born 17 April 1942) is a Dutch drummer and percussionist. On occasion his recordings have featured him playing soprano saxophone, bass clarinet, trombone, violin, banjo and piano. Though
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 0x2380a41315efe3887f134fd635f8f0e5476ae75b08de923fd79b4454bda5428d. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ccbc2254-0a20-4813-9245-ce377a50ef43.json and https://artists.proofprofile.net/proofs/artist/ccbc2254-0a20-4813-9245-ce377a50ef43.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).