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 0x3d4c608de93fd2908a3a7e0bffff2f25b481744a1bff211c267ee972f94b03ef. 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/8a8c1d11-d7db-4f7c-8123-3ddd072e6222.json and https://artists.proofprofile.net/proofs/artist/8a8c1d11-d7db-4f7c-8123-3ddd072e6222.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 0x97f667b84ce90829f16af4955d5f73af3d77bdcf524f00def3207c73112f799c. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/US3DF2233218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99b70e250cc1d1cbae4af14028025e0509f14ac817e4fbc29f0629c0f7d5652. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/US3DF2250270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c690dc96205177750d2e751d95dae4766447e21a290a7cd707a1eb62b05d3d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/US3DF2269076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c5bac4996db90920d4888baa5dfbbb9d7b13e13470f798425826823d6a957d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2221678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe505d571a73f578c74cce2ebc77feb4c8901f237b8c7d8ad9f401fd9e1f9de3. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/USANG2264137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d8b22bbe6f24f110abb85331b87b912940996821920909d7bc33a96565c5c7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2281790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc8ab8b426eea3210bb12666cf4ba23a14902a9504694c7110c3fdc7cb9fce3. 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/USANG2289557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f12ccc8242335fa6669a16596f7ff1541b57958fc9857e7c94e3ca548293857. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QM3DF2204120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1c7b5cabb60dfd968358c2261c687241e580f8261df4c76a56aee4244234ab. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM3DF2243306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6947854725754c6d9745df7737b0c125db7f8754e63fa082e07ff70d702e1780. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QM3DF2269011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bd503a5344d178e85ca3288f272b1588a6cba4651e3ee4117885863e1c25af. 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/QM3DF2278119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b0374846edb7194001ccf49994bf69613900f0429f892a4fa817b504ddaf6f. 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/QMANG2201311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c6ecb95d1237ffa1e4d00d4c2d9266b2f5ae86c666a1af37bcb7a4982ead4a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QM3DF2293826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfa3c05780a59e96662b35308cff40cc4bcb60dfbcfd856608a25572b3d1716. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QMANG2231060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4de6ee2677972da388e137372a5f52a8be9523a94b581173ed5ba65c0af2497. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/CH7812402483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8bf466841d70b944090d2614254f5318e706ba974d94613446466fdf81583c. 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/US3DF2418463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fe096ddf52d5428e32641edb24ccafce31f2055a9c731de50811efb766fa78. 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/UKZGC2404022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0039944ed747d8748529dba82920c62881781599479c9db33525f88fae4e2189. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2453115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21413b2b0a18286fa3add5138c38778dd1cae653def1efe91a669a37b8a90b1f. 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/US3DF2489129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bd6b536278d345112c805883e52eefd00964dce3e9966e75d37a091767dcac. 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/USANG2522544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e76b2a78e3d70c993b0a7c64b91c67dd51a691c592c9f7999af9886ae99812e. 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/US3DF2418970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee44168382c17c999c3d6b085c66a7070f224acf3bb8bc989fb34cb6a815d23. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/FRIDO2210443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5481fec3b80a656dbb376f83e66a0d10315725d2a07741df9821b886409269. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZN882394957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d94542ff03b2b09f42c30fc901a7c078cdcbb3b8691a17f096049a216f9f07. 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/US3DF2417367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d933bfafa6b285f9dde5d641d92672a7b638ec95da1dfeecbc06df852d7a1a. 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/CH7812536513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dafe672663d8a6453576087b8fe987b5953ad0bc39ef8d40d598a35ee085a41. 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/CH7812527968.