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 0x1e05bb0c8fc76b9a02da4e466a85e13a0ba30280d8d20f20372d1b4d698b5020. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52b0cb0c-4768-44fa-a252-41d2a05351b9.json and https://artists.proofprofile.net/proofs/artist/52b0cb0c-4768-44fa-a252-41d2a05351b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
剣が君 百夜綴り 二重唱（デュエットソング） 夕凪の章「螢・縁」
Kengakimi Momoyozutsuri Duet Song Yuunaginoshou 「Kei, Enishi」