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 0xe529c631adcb0dcf6265e33853500be9912af1b2990b49343d0283379913430d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff994e48-d035-48b4-b1c3-1caafddbb3d2.json and https://artists.proofprofile.net/proofs/artist/ff994e48-d035-48b4-b1c3-1caafddbb3d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
「けいおん!」イメージソング 田井中律
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ff6535718a4468bd9e9f5cdc9daadfe1e2a7efe0ffa927ccca9bf8e17cbc12. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC00902296.
「けいおん!!」イメージソング 田井中律
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe444802c829eaf382c3e5a722144bfb630b3437e7d9facf16d7cb32837e861e6. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T04:59:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC01002529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c7102cc03fcc85f45b0586f6d23e253bb61a14ce9b6e25977021edbaa829a0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:36:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC01002530.