thumb|right|200px|Todd Michael Hall from Riot V at Headbangers Open Air 2014 Todd Michael Hall (born September 27, 1969, in Saginaw, Michigan) is an American musician best known as the lead singer 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 0x8ce7300eeb6b7c4aee4e8fd8892343dc3c6082f3c0ba31859cff32d1bd1e0e22. 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/425d6cfb-847a-49ee-9035-c422a00fc778.json and https://artists.proofprofile.net/proofs/artist/425d6cfb-847a-49ee-9035-c422a00fc778.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.