The Serein () is a river of eastern France. It is the main waterway of the Chablis wine district in Burgundy. It is long. The Serein is not navigable. Origin of the name Serein is the French word fo
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 0x6df1d9e419fe5e4c2933a4a9dbcf036b2dfc2896d803af3797b958f64424215b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/610a3a26-c6e1-4513-a194-4a133b6081a7.json and https://artists.proofprofile.net/proofs/artist/610a3a26-c6e1-4513-a194-4a133b6081a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).