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 0x4d9c979a2a29b268b4d05296df86848f9a119bfb357ee3787f1a036a22d87fdd. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a726e14e-dd6e-4c99-aba3-034bee5df74b.json and https://artists.proofprofile.net/proofs/artist/a726e14e-dd6e-4c99-aba3-034bee5df74b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
岡崎司[WORKS-2]ベスト・オブ・ザ・劇団☆新感線