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 0x0e860f310628ab812a721ddac6bff8ec4c1d2560a08b07779d421a6b832bdc86. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de5ae1d9-9d5c-4e7a-b006-2e941cd97ca2.json and https://artists.proofprofile.net/proofs/artist/de5ae1d9-9d5c-4e7a-b006-2e941cd97ca2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Hanging Tree (From "The Hunger Games) [Piano Verison]