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 0xfc7fb36bdfdb626ee4026eb9b98e7b7d5f149e6757f74fbc2983b96b3a775b60. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/677e92bd-2483-402f-ad77-25dbd24464c2.json and https://artists.proofprofile.net/proofs/artist/677e92bd-2483-402f-ad77-25dbd24464c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
[0317] Keihin-Tohoku Line & Negishi Line
[0716] Hokuriku Line (Kanazawa-Toyama) Series475
[0514] Saikyo Line & Kawagoe Line Rapid (Shinjuku-Kawagoe) Series205
[0457] Tokyu Toyoko Line & Minatomirai Line (Shibuya-Motomachi_Chukagai) Series9000
[0493] TOKYO-Metro Chiyoda-Line Yoyogi-Uehara_Toride 16000Series