Dorothy Koomson (born 1971 in London) is a contemporary British novelist of Ghanaian descent."GH at 60 | Our Writers & Their Books", African Book Addict, 31 March 2017. She has been described as "Brit
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 0x8227b24a54759bf2b7a4ade404591b5a8cf9128b398a13c75339d719f090c1a0. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f299bef2-3453-4b63-acba-54f50c718130.json and https://artists.proofprofile.net/proofs/artist/f299bef2-3453-4b63-acba-54f50c718130.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.