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 0x013afe81f9ea86f6eacb429ea6532ae11e6c29d609708932c1ce9cb3bbf24923. 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/d6d781da-f000-4c3d-8bd9-08f6e175bf21.json and https://artists.proofprofile.net/proofs/artist/d6d781da-f000-4c3d-8bd9-08f6e175bf21.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 0x6a3578f5d4a068fe26bddae0d75e27b352d81f54ceb1739d8709d1ad8b38178a. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/FR2X41994996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398a2b2970411a3bbd7a4c33c63bfbe48b2cc9cd6ee3e689b80209c2009dba42. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR2X41988852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731bc08d9a354d3b2a2c3ff9aec8683b6ed38ab8c41e238f18b3a61a84e167a3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR2X41957356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74c87d1e62119390e4fe76f50824191935c2620b9cdb1dff8de0d1f94f59ca9. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/FR2X41988861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df34350e6aba3b7ea0097df2b21db3cd372a4e27e10e2c07d1b93dc48879b3a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/FR2X41988867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1773cdcef7e58406c080a45db221d58a9833c100f07214795e40e0ebfbb2552. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/FR2X41988870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb0b7558b09c93014832d5261591246c6dc94c3064c2c30f43e33e7d8ef4fc9. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZN882320238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7cb32bca143b10d9c872fc8b857ef137b8fa05ab82abe6c24dd0796e1bbec5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ESA012248860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c336c373586e3ca7950612f35c618bafa9fb096bb436350f7e1aee7e293dbb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ESA012256842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1d142f01054784fa3a4d97180b50aa76b73debba1ddca2f60d750e2ba27309. 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/ESA012289385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb057db453179e94f3b5390b1449581988bf913b258734edbbcb01b1cc869a013. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ESA012238325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e45c5b661cba48ede71777ca851feb59f0dea3a1abae50366d7b5648d499a21. 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/QZNW72378218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b83f94e3a67802725a2d331b4ff7a5c08e503407ee7a2bcc6afc006fe8dc96. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/QZXLZ2327310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66748b68d2a69a4acf4801fffbde54843df5b5fa3868d3e6b5a3a7ccd34988c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZXLZ2388508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e34c307f0d5d23d8b26673dea598353c8ca1fa53d70aa6612ecd97dd9dd0da8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA012364866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a508d25a80a689e28edc1188490ca220f944163f58aee97d2edf451a6201b91. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FR96X2468757.