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 0xcace55cca16a6e38694ebd61859e627c6d00a046d8538f76bab32536ef02e5cf. 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/99821467-1297-486b-aed2-becac95732f6.json and https://artists.proofprofile.net/proofs/artist/99821467-1297-486b-aed2-becac95732f6.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 0x2956646670c6387a17dfc50ceb38399a84345f7c6280fbc0e2d1c4c284334d4b. 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/TCAAU1163421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9391ebbe61a45d58b89384a4af520fdaacfbd38fc8db0235cfcb647ed9e0ac0f. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/TCAAU1163422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de24ee130dff449273d6ac76ed4a420d7c7022cdf800ab314c864f36b5c6d5d. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:10:05Z), 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/TCAAU1163424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca9d86ab89100a37f6d5605063d3ceeca2184457e35dac9396819f4cafb34ef. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:11:42Z), 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/TCABD1261164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d6e46c95a293e88d3ca33e2f514734f5e7ddd9d0d4e5680c964491d67bda75. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCABD1261167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b848ecc8b03d0669fe45ba21e1eef6e70ff06d34018e26c8af9ccd3ee49c71d. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCABD1261175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb29d992960f5a97971137cf7f5f93fc45735f9b41a308f1ff52b5f6f26910b. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/TCABQ1396286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc541d10e01676fb2296672d66cd0ade4604426b34af099fd8339e63d4e3ab72. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/TCABQ1396290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e61ac8f60cb9832d35824f333a4018757b6e4f807ec3a9bc5bc84101478d855. 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/TCABQ1396291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06ac21eddacfd1f1c6397cd80df18ab0fc24523aa2bedaea90ecf35995ae21b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCABQ1396294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cf838287c4f285cd228471ddfc3f4369176a3b219f2e8d70babc1bedb3e66a. 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/TCABQ1396299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f8a0cbbfcb4bc3a5605efdf5489cdf30a69fe966db773f4bcbbde80c118a88. 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/TCABQ1396302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e15d58e9f4fceafed55225376d53ce535c4c296c223d0bd21067e7e9a07d42. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/TCABQ1396323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a403ea3d7fe07a2bbde2f9a53a73c048c24c91b36c345036b29b15a25d84d00. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:42:32Z), 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/USAT21705225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2deed034f0df7d290dca4206f378dec1d498c84848bad5a147dae16a4efe00ae. 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/USQY51793031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8174f7c1a7caed42e119b5b95ec040b182f0a4c671a4a2564c4814557e7babb4. 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/USA2P1805848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba058b0691c3d3b33d66094b2d7e068aa42887287708695041618d2ab715af0. 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/USA2P1805849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e2d393ea37c45533ff11d76ab3154b07f4af12c4a0e4062f38dc43be8085bb. 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/USA2P1805850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3daf90277fa3d1d78d9cb896745d1a4f0b21efa592b9cc9f81ad750993273b9. 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/USA2P1805851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54591d87f052f6e1abebbb9c3fd18db0319b33b38a990e8a5717206b58138c7a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P1805852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c101879dadf2bd7d87f02e27565dc63f93ce583103c79a10240b4361984710d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA2P1805854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2951cfe0c16f9a306ca6bae2009f35d9fd3bb52224a2a4a37cb3236428ebb56d. 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/USA2P1805855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbb89527480001273d24dd542a5663344019bf9c9b22ed8a55b4ab8714d1fd5. 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/USA2P1805856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b931b25e9773ad93a9e7b24bdd9d715bd390a726790704fe2b0564ab3b83bdf. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:15:57Z), 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/USA2P2015410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf45419985d78038754c6627c71df795fc40b38e7532abbff9425e6ba1de59e. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USA2P2264038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf267186d3641f3bc6435c1cec03ac80556df3aa06176de931b7860e749244b51. 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/USA2P2040840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f927a35dd529d43bf3003872cc795912688b9423b1160d54926a8c02259f6f2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USL4Q2058573.