Jean-François "J.F." Jenny-Clark (12 July 1944 in Toulouse, France – 6 October 1998 in Paris) was a French double bass player. He was estimated as one of the most important bass players of European ja
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 0x709287148df8a0d29cace9d6d3924f87ebdd3009b45dad781a1367db927e9cb8. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bd84fc4-c13e-467b-a117-eec55cc9e7e9.json and https://artists.proofprofile.net/proofs/artist/3bd84fc4-c13e-467b-a117-eec55cc9e7e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).