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 0xd7d3c554b30e2e5b26891ccf098930afbe18d5da205369b52ceb0e750770a5ec. 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/2f6ff1d1-a13e-4938-a1da-96263ef0cac0.json and https://artists.proofprofile.net/proofs/artist/2f6ff1d1-a13e-4938-a1da-96263ef0cac0.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 0xd8b7a5d38cb02efdfbb0dedbbad39096bb572275fbd0b099403fc8dd62437268. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FISRK2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915dd9741948fc4514e9661b6450ca9a8c40291bc1ba15d0283f4f5e2047e7a7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FISRK2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495f8d42028b836010ed9c98fa6bfe2aee6054d0e2ea98d750931d9a7d1dd8b4. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/FISRK2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eb116fa6d086beab9e09af74c91f2133fd2ed40e3ba8ad24c6024929f77322. 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/FISRK2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c210455bd314d20abb335284643c1b2e3c112cd309ba88ddff23b490f0c1aa. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:58:05Z), 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/FISRK2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f11efa6f81e84ab7e1b384978351bcc9d063acbc04e869e5d50290d3f16db4. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/FISRK2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7cb4b69e6620a83bceeb6eb7e7b9e1bd20e7f3a76942555dd0d1103847e1c97. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:28:00Z), 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/FISRK2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2479d10d9957a2221d9825392da9ff933cb10699104c344f333ba45ca93f3bc2. 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/FISRK2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647bd677507fd84756f553b84dc181e2b263f1e557fb7ef4b03c8bd907c9c746. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FISRK2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e468500843844e182323edfd1b95bd4452bb3995a91d684b2ca8ceaabffc39. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FISRK2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b9eda0ae95701a32e98ee1500bde3e136273a22c8d6b99ee7a916c00a39e76. 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/FISRK2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aad1a97f05f1b3ab8eefec39104125e34a2db0b639068392bac92650abef682. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/FISRK2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa3234013a5fe8aa13f5a1bb4d6e748cc922273b306ecfb3447f5439b2ad839. 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/FISRK2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bcd8452365888a9f6ba052e5d9894ff0e366216cf578eac33a6e01213f4dcc. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FISRK2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1593b0aec2e1313875af12f00bd5a7fd49426340e0edc3149e14f0b2c86798de. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FISRK2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa383fa737e1104146cace423f5aedf0ed3d5205cfdb27ccda334b13aaf655246. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/FISRK2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71acc2bff5cb166a314b8271fd2db9e8138b32b56dad4cab0f1aacdfedb7f857. 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/FISRK2000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3815fa365c50f9f9192fd38af1f918d5f03750a6c4e6590612091fe9e919085. 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/FISRK2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6317d6d2bc59cda3a0eb24486f057e18fbf271975aebd92c7006b0e0953aa10. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:52:04Z), 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/FISRK2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97278c0eec3476d8e1a2fc4f18d4d79d558cd453095284ec5de4536ac0b1a7f3. 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/SEYOK1926971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31eb13a2a42cefe8048218f11febe69225325f66c466453eb56d4eb3e2f58dc4. 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/SEYOK1926972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c35174974d1845653ed55c825b5b547cb493a1edcc4b7fcc89d346b412845e. 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/SEYOK1926974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc161f72cefff1eaeb6800446dcb49896a6a47081a4a87219c2d7f78d227906b7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/SEYOK1926975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb6377b18c49d0791c4848f023d4566a23d51208fad588731d1701fd486b460. 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/SEYOK1926977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecc2017facba9ac8872b816c5c94b030a7e68dffe636719111b5532817964b8. 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/SEYOK1922728.