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 0x460b08021e65bed5d911b9bf5272310bd4c25b80b4404d0be14b36f9d31cd9b5. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d680b7af-9907-4c4b-90dc-ae5b2ca20b18.json and https://artists.proofprofile.net/proofs/artist/d680b7af-9907-4c4b-90dc-ae5b2ca20b18.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
妖精物語ロッドランド ～母を求めて30階～ (AC)
THE STEEL EMPIRE for 3DS Original Soundtrack