Rossel may refer to: People Eduard Rossel (born 1937), Russian politician in Sverdlovsk oblast Élisabeth-Paul-Édouard de Rossel (1765-11829), French naval officer, explorer and hydrographer Lou
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 0x4b8aadb268ab374a135fcbe591c9db3b0b0e7e3b405b2cd26fb4684a9248e800. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f46dff93-0ad7-4279-b154-b9d76b334946.json and https://artists.proofprofile.net/proofs/artist/f46dff93-0ad7-4279-b154-b9d76b334946.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).