"Winter Is Coming" is the series premiere of the HBO medieval fantasy television series Game of Thrones. The first episode of the first season, it was written by series creators David Benioff and D. B
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d87d40dc8b08a9a2776d0885c03ecf37c2df517e2fd9864dd7d6933981b669e. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4dd0d24-ab41-4954-b1d1-5365cc2de641.json and https://artists.proofprofile.net/proofs/artist/c4dd0d24-ab41-4954-b1d1-5365cc2de641.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).