Jack Howard may refer to: Jack Howard (ice hockey) (1909–1983), Canadian ice hockey defenseman Jack Howard (cricketer) (1915–1993), English cricketer Jack Howard (sprinter) (born 1981), Micronesian s
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 0x05998ee08eafa0b1f8cbb997f36f10981325c9a929954b8c36f2344a50e48ab5. 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/7056f5cc-67e8-45e0-82a9-f0d51a04a401.json and https://artists.proofprofile.net/proofs/artist/7056f5cc-67e8-45e0-82a9-f0d51a04a401.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).