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 0xbc230a45fa595e6280e661fb74bf2cdcbbf3fd604c8411ffa1246372dfc33e76. 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/6df6f98c-ee5f-40bc-b9c9-f87f03cc6c2c.json and https://artists.proofprofile.net/proofs/artist/6df6f98c-ee5f-40bc-b9c9-f87f03cc6c2c.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 0x1d04575e781ba0431a529a4422775c08e6d5e7821585fc8587426f327ded44be. 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/QZHN62072136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872d5bbeb8dbc9502d0d5df24001aeb46aa6ffb5e7e43fd3894d316e22b4dd35. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHN62072137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828a4cd5259743cd9c5357fb52976e89d901eedc1f0fe9ba9ef7988ffd7071c9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN62072139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a77624f974af5844cc99c96b6fa678c36b4a207cf0df23cd25f49279224e8c6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN62072140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b1645212fd7c7658f54a0cae6530380f0196d3afa1505e874c245baffd650e. 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/QZHN62072141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d047230b08bacb4e9204948a1440bfd429884671eef0141bd770b823c83833. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN62072142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96efdbd85db589efd60e3b6a6789eba7d7bec9c3c2f9a55d8a0586255492f33c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZ9Y21735539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7b59ef9fc2f9459d2592669d04bf0aaecdd70661dcabd306cc1c78d6387cbe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ9Y21735547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c9c62f819643b7afe82eb17e3da3594d3c44eb6c636679ae310c3b4147af7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHN62465271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4748796defd081e01fdda257c9da9b24787991b2bcf081066e49b8a3c36d3f1f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN72441131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa2348e02be26f3a7a03f199426cde60a5987cb3728e929d91d73f30cb8e610. 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/QMANG2231113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a02ec03583f8e9a663b36dc7e28e02be03d52159c95823836afcc629bd7f3aa. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZHNB2332899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd8a35340bd58f64f9f04aacec000bd71202a989a099de3c4bbb3d0a8bf4b81. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES62310630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce3fb021f105e5191a7087de95c461aab1314c4c61c4a43bbbbfd21ae76d464. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA82341664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbaad86dab9a316b4c21ea0dc3c71c760ff1aecba4b359f5429a5cfc8e0f4b8. 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/USANG2217127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9dfddf5f75a3f2f97a0a03253cfa0b239b6b53235dc878a557b904bfbd2f50. 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/USANG2222506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6d519179e64ecdafeacbf436923fbc5961def023e7f97be21504e2e5978651. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZRP52254729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb13a0ea28c547d77c2509cbe9661775dc983e6cf605c88a591fca9cbf5760e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZRP52254730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21be18f8f36fff01c69a14b213b421915147dfe3d42baf1f403e85157c0d86b2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US3DF2297544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0492f933a1802f408fc33278533d936b55651eac2ae1d5c8c87eb4ce60249bc1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/US3DF2297546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb91ffbec815c4df0174b96c493cb0f466e92f4811aac70fa09be243c41eda54. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZMER2265197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af6f0dd1131ee79fced935853f19cf00a106bfdb546ee6c18020acb80938c6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US3DF2273859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af791ee988327fb74520f82fbde04f545991f01c00f2ae5dc9acd90a3cb9703. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USA2P2217601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d92ed8eb1686fdd3fe0aa205056634f6b5742e87a54e940a6a58d44041510f. 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/QZHN42243302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4975f6cdf8558d811c3fa0c6b91d00027a2f74a9cf0b2d8bb44ac54086b5522f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US3DF2237893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf91fe6371fd826662d0021d7b645fdd9028b793b5efb1440b1da5e567574670. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/USANG2126284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e697e26f7bf9ea106802d365dc1e50c8156d54a5205c4a725cd68423e272e3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USA2P2217716.