The Sea Shall Not Have Them is a 1954 British war film starring Michael Redgrave, Dirk Bogarde and Anthony Steel. It was directed by Lewis Gilbert and is based on the 1953 novel by John Harris, about
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 0x20c265aee074f80c9765eda05a4aa56a2eee80b72f403e9f33b7d9d40b30f05c. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad919df9-2499-4c41-b14c-346666ffb0c0.json and https://artists.proofprofile.net/proofs/artist/ad919df9-2499-4c41-b14c-346666ffb0c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).