Green Ice is a 1981 British adventure film starring Ryan O'Neal. It was also released under the name Operation Green Ice.GREEN ICE Monthly Film Bulletin; London Vol. 48, Iss. 564, (Jan 1, 1981): 92.
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 0x18059492861fdbdffb5d9c527c285064688254bec4b54cd8992ced900f536c6e. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a51b93d-ec02-4357-9bce-a56afe2c9cb1.json and https://artists.proofprofile.net/proofs/artist/3a51b93d-ec02-4357-9bce-a56afe2c9cb1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.