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 0x5f04eb4925aceb9ddd9aef64126b62518109733bc140eec824f9521e7a064549. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15cda58a-20ce-4f0c-9049-559f125d702b.json and https://artists.proofprofile.net/proofs/artist/15cda58a-20ce-4f0c-9049-559f125d702b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 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 0x42564f679f5c3bf4fd4b01e1f877203c1c604e3e052222f76c2c66b485e8c82d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BKBZ62400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158e0473ee1567063e755b1c91a0f6554ef0782f9ad7370169809ee3efeb2359. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BKBZ62400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe57f6f60512263e600283cf54e9580bb2eff7537f25aeb23850ad3038dbd57. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBLFP2421778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06ac0ba11dbed6e0aa0284f60d117a5bd2375714e6b54ce3dd76595d764b663. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BX9ZT2400404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce8ec28e0637e00cf87301afd6edb10c418dd671b511dcf4200eeb167d7d84e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FXR592400805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd6306f87e63b8c23a48874d090523d21da8fa7d82e6168736761b66ebf71e2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BKBZ62400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7033148f7e97c85730fbf397d98c33d6ad9c2c812b3da6e574c236723073c46d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BX9ZT2400351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28a142727638a26f9a1a1682f7f1562da4b8dd245ca7d0d0eb334eecc105f4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX9ZT2400347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c812a5072c11f4cc560fe677b2130db5e2a59533b880f88fc2fd7d6092b158. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX9ZT2400520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06ac0ba11dbed6e0aa0284f60d117a5bd2375714e6b54ce3dd76595d764b663. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX9ZT2400404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3ba708063c5f5814b26ef9ea6af2b21999c4a15d8e1150745b92613b76b071. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BX9ZT2400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff6aaabdfdb220cdb7a9da9c6ddb6777fae5f4350e0ab99ef3e1cd03cbc3476. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BX9ZT2400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d1a74d6e7e10b29041e3f18927dfa884a450c792fb40031924c32d9490bcd7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX9ZT2400367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247e68bfb9763428c5ec73c159b52b4942714393b3618a0364b996dc692e17e4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BX9ZT2400348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbbf00682a22e8216c66c9095b08bd6d0ceefbd5e65606e09fbb08c5af109d0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BX9ZT2400349.