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 0x5fe7c241ed55ed5234af88a380f92f0785a0b3cbd00e5cb8fc7bb39675e49d56. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cd1c44f-a70f-4183-82d7-2a21a9e26bff.json and https://artists.proofprofile.net/proofs/artist/9cd1c44f-a70f-4183-82d7-2a21a9e26bff.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 0x2ed0723bead96e27c652b3ef2f8885068e124ed01fb6b6fae5f1aff6d92d0791. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/LTE499900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592a2d416b3a01f4aa576d174d38afb5eabe98aa9c9eceef9e499cf43c5748ae. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/LTB600500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51d4940979a89e7abd930d2055118b1d39616cb2645d0b2cf0e59523e858829. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/LTB600500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde62902e5d8e466cd5f494d15977a556d985493123214f7633d5dc3b9fd993f8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DKFD52496019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e1ceb2cc63ebf45c64f36e05039da24da020a3d84a949ff511987f83370747. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DKFD52496001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917f3a0fa97510aa6a2767783b43439964e9c84da163981fcb1fb20e179a6be0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/DKFD52496003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ab3fd9f58b78e2dc520ad57f26d2cf19383f7a0efba3b89974300fafe9383e. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/DKFD52496005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee70de5dd41b26ee105a5b422d5aee0d7d56e34c65cc8c6bb60eed061951f80. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKFD52496006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe303e14c86090f766d1a97b706388616a70abfc398821ae298f4c11ae1a98b44. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/DKFD52496008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d58120b6eff8867101929eeb4f2c5a3ec63b0e0ddd8f405287c80af45e338ea. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DKFD52496011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bae4077f18c9e8620f6333bb116a10a6d074bb4a8ad59da0bd42293d6d325f5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DKFD52496012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22ee837d87b58495f241adc2626a45ac1f017b6314839d8976a8354063ea876. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/DKFD52496013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bf0ec4591b9bdc70518ae218aa7fbb3d77db6ce103d8258ffdd78b2cda13e4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKFD52496014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749bd55fa533bc57ad678ff146e40dbc7ea16109c87ce1b19b234e6448f925d7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DKFD52496017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eef63213dae11ae4476ff26a516e53ee6440f2efbbbfb51f0b30032faa68c83. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/DKFD52496047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd684d97e28f9c2f4a8c1c78407424647eb894608946fa86d61205c351fb7571f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DKFD52496056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255cd95a09afdf2fa5cdd3099cb56305c7712f091aa456f6ad15e670af2f23c3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/LTA861600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8151727ae8f9b1ced70f0722ecd02d0ebf9e5efc316c36cf9a27a712b3484755. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/LTA862000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ffb8a163dafaf7ea57085e421d0b20b9772cf92b1624310a614969276d421e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/LTA862000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf99f97ab68f1a8c7d0c058144504e1fba42156037d80bcf3de8f3a278b86eb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/LTE492300011.