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 0xd217ae1bb2bcb1136b627dc62d19ebb196e6cefc75e31acd1f1df5a82fa8cd85. 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/4740c0fb-43b3-412e-b205-5a28bf99832a.json and https://artists.proofprofile.net/proofs/artist/4740c0fb-43b3-412e-b205-5a28bf99832a.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 0xf276fc122251aeed7f31d54a37cd2592680a32e48e9cf166c722d097fe0f3d19. 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/USQY50926459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e33dcb428511fd48914b9c9c25509dcab8e20177ff17cd47e5d75ecb111a7ba. 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/USQY50926461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6dc1e3cbbc991c1b1877e225acab6be7c3677bd6a8046ff1c72f07f765f6fa. 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/USQY50926462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82010534d4fe643c8a817a939e85fc5f0da82d11a7b8d7054fbb7fc6153db68. 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/USQY50926463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e360bb5e324414dc92aa0c00c089851a108a97ce2dcdbcce541f3050f6f5d9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USQY50926464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3514f856846d98b9d30fadcd227047143b075ec34d6c15ad22f0236a54268657. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/USQY50926470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a68a73ee4cf99f1c7a9529f318c89be2afb76316a02e3c474c946ee1007809d. 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/USQY50926473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd70e835e30c432ad72c8ae9d8acf883d2f598af7ff2dbe03d57ef94a930f2c. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USQY50926475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa48aaafe31c1829693053da54d2a3663950fb6653610b7074f75b6f7071139. 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/USQY50916422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed6accebc65214d9a0e0b6b49b854707a74399c9232378703589b20f684b01d. 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/USQY50916423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf57efc6ee0c415477d67b7459d5cdfdde48f3f2806f65a9f2728589b93e363. 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/USQY50916455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf42bf2a02911ca4368c7d09adf44372372f472b6c08376b953a86e8a41473c. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/USQY50916457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d9d2a8eff01c7454512d47988e1f5ad194e7236cf48939c49310cdcdd3a515. 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/USQY50916461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acd4e096514081ea86960eed47c918558b6ead1a26fc6d9aabdaf9936fb7452. 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/USQY50916462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e959e24b55546b2fe5f790294846be29f94d2b64b9d5e80dfbf3c06929ed86. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USPO10200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e5b9fcee0c206972b19668e9f1c8c145ba5b5b089006da37e9436e1ed12536. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USPO10200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b7d9ccbbb3f11e08d3deaaf3c2e6e1c7db712c52b9e5147d4a78e88a68d287. 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/USPO10200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47efa4bfbc7318d524ac641301adc6077ac9a49818a57835aaa7634d337969c7. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USPO10200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe932ced196e9b6112d0e93335136813e75b27f27051a1a564a7572095d5028. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USPO10200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110d2420ac097129fafb4d46486aad6142a9bf738a121df8b126d038dd66e54b. 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/USPO10200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6edf906198e78c64d3a72a1a8269fa3ac4d77c20c8e135fc3e1e5d032d2db1. 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/USQY50911182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330fecba2fd888cce9194ce65d18e60d5a96bf3ab46de69a6531d458f817a173. 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/USQY50911188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6902c5a306f88f5c3ff29ac11ad68afdf4fcf79f1d17b8d354e800c3e7b76dc. 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/USQY50911189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdcfb18fcafe98c873b8f375b162b166809957527d7e48c44ba927dd61d87ae. 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/USQY50916380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73e806350501b412a1eb3832bbe52377a36a3e68dd1d43db85fee9f70e96c8a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USQY50916390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5a57a455ac247e69ba2430f63990abcd86485c7c0ecfa607558d642e72c714. 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/USQY50916391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39360b54597865949583dcf3c130b6825f9eaf28af40a8b61e1c0a3db00eae26. 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/USQY50916397.