Harry Isaacs may refer to: Harry Isaacs (pianist) (1902–1972), British pianist Harry Z. Isaacs (1904–1990), American racehorse owner Harry Isaacs (boxer) (1908–1961), South African boxer who compe
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 0x3ed39498e32a5107d36ebc092a70cb8b5be33dc4cf0dc50ec3625d72fe3c2248. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b415fc49-7e5a-44ff-a88e-a581ed5642bc.json and https://artists.proofprofile.net/proofs/artist/b415fc49-7e5a-44ff-a88e-a581ed5642bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).