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 0xe0dd51b2f7009dd143e16dd01dd93c54cc83f32c2c36a108793fd01c9f7eb591. 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/a47e443a-0f9b-4f54-ba99-e8d5a04cd63d.json and https://artists.proofprofile.net/proofs/artist/a47e443a-0f9b-4f54-ba99-e8d5a04cd63d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
7 histoires docs, Vol. 1 (La nature se rebelle)
7 histoires docs, Vol. 2 (La nature se rebelle)