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 0xf4a469cd1bc563d5fc26fb9e0db4db3c62defa2f8a478bad097887e443ce2eff. 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/3557ef52-6270-4e0d-98b0-826027476cd4.json and https://artists.proofprofile.net/proofs/artist/3557ef52-6270-4e0d-98b0-826027476cd4.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 0xed337f0414f17643375369e06bfd55124fc203563ea413c37e9c16b45a13cfd5. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/USQY50938094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe1da3447e9aff987f9e7ab84d10ffb4d85f3b48a1ce909cc51e47ff63f1727. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2U1000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61bc2c783ee9660b743386ab86feccc7dae4f76168937da2ddeddb6b39bb2c9. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USA2U1000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7feaa53a06315aaec661c0c67dc44ade396747b23846ec092bc7499bb5a664. 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/USA2U1000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e426cd5c83ed34958b67748dbd15177d851252a2cddf060aa9dc72e404719ca. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USA2U1000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f10b9e62976e067afb4de1d2f5e2d01e4bc2be0211e1b79a2bc165d7cb61f7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USA2U1000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0279d2eb73213493fb1155f7e63601c63c2b83145877ccc909fede03fc69ef. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USA2U1100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0039c10db0dcb996084f55b7525fe5dddee7e9d287c8428b18c79a2ba2c396f. 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/USA2U1100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb6f95f9e90f45bc8c3f6c49075b1b09e340db7e209900fec22cbd9c71ec6da. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USKO11300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0c74fad55d6af631a71e811dc94101803ea9e30b659df660239587015325ce. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USKO11300263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705be40f7b1a692b655f6aed0cd5c7f1754ddd44c8b664321b6a7c8a0e0b5f17. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USKO11300264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7abfd3b8430ce3d6a70341501ad86bd76a9dbd0c203360d28dcc73a7d4fcabc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USKO11300265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797f70e23f2d2c875f0ee0fd3064565e6c5bcfa6d400dba8e9c985d4ef88c91d. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USKO11300266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc765c87402157352e73ae54c3f53e23e536b9e30d234ac45a078203485f764ba. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USKO11300267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1b407c7c191273df9b0f24c6fd168cfc31d60f02964e88a2f31c1369cfb5e3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USKO11300268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204a5932022ec5f7b24de0b347c8b299ac654e4017f4ae620faf14b4e82782a7. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USKO11300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41427bbd6543549e5440f8d6f219c478b809f28951ac6efba9e2d3533a003461. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USKO11300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf706cdfd4b9eff9bdbfbaef0add1afb750aa1adb9789b21133fa1e47780dbee. 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/USA2U1300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c37e86622f52889447de9f6b44dff629c9960526f8ba6723c28a1ae0f60a94. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USA2U1300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9752dcc083a2b6f13279d1a33312ca3ced2641f6d5ff57f5f46bb3e4810d89. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USA2U1300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafeff1dca74c10c0533c7f59b9d73f0612c0f2a572e4d6d9b4bafa16dc6f7fab. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USA2U1300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf615657cdebb669900354eaec04bd67e0dfab70bb5b4da4f6284ed80b4348cd. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZES91806925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb77c787a6cf68caba1d8af286468025a7d1f3751ae0221863322f44bea1d964. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USA2U1000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ee2d5913d07d7b6123af8e8b72d360619feb711daa385c4d353231661f1891. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USA2U2000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf615657cdebb669900354eaec04bd67e0dfab70bb5b4da4f6284ed80b4348cd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZES91806925.