Michel Portal (27 November 1935 – 12 February 2026) was a French composer, saxophonist and clarinetist. He played both jazz and classical music and is considered to be "one of the architects of modern
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 0xfe9483ec35edebe51ecdfe2a03156c220878998865e9ca4a697e199f00d5bc76. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91cb8b35-6937-4bec-ab0b-5d464a8e3967.json and https://artists.proofprofile.net/proofs/artist/91cb8b35-6937-4bec-ab0b-5d464a8e3967.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).