Heidi Louise Thomas McGann (née Thomas; born 13 August 1962) is an English screenwriter and playwright. She is best known as the creator of Call The Midwife. Career After reading English at Liverpoo
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 0x80c786db41ea236e5a68d4f72c5a501dc1357374f340e883bb5e5f1451a01222. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b009107c-44cd-4989-a6bf-110f35698544.json and https://artists.proofprofile.net/proofs/artist/b009107c-44cd-4989-a6bf-110f35698544.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).