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 0x359ec2e05821e17436ca4ae7ee8c98021cae748688d18d7d1a845336c21efefe. 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/8fd6dc42-796f-46b7-8db8-7c17ebec400f.json and https://artists.proofprofile.net/proofs/artist/8fd6dc42-796f-46b7-8db8-7c17ebec400f.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 0x41ac6edd2a4838f2b6386e99eaae3a2aef5407d31ea9d510a84d3a24bf3a1eda. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/FR59R2478916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab621b379165ce585dfd334cd4ef73ec6a7db24fb7e047b21c1edc4cee32ba86. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/FR59R2478878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c9b318f064f7c20b2735ce681f919e39f06949c2197309f85a35708db828ba. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USANG2453709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b8ea2a9f808352c9d0fe6d428fa0fe0628b754d9b0ce701e3115051beef3a5. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USANG2456714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428d020c2c8f6780a03b2e7cf3a0ee99dd245fb17bf878148c9661e3dacd00d9. 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/DEZC62455780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844e91e14a0f050b84b2f7cf97be17d6281008ccd2b7951f845481706166316e. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DEZC62458313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc18da2b754f72c2b941811afa02f9be2b6d0a3b5f4884767885cbeb8184fbd7. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DEZC62458651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a7e78e01cc2eddcdc70b4acc331db781057ce6c8f1c2f345e660bcf0b837fb. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7L2440774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bf310b5a41b03cbc5b58e34e23b0b60543f6774b46da8e13898a6dcdb3fe20. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/USANG2490946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89f80315cb329b770e79dbc99114c79c7895946c30dfcc1a5744afe599bedf4. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QM3DF2405779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07b1a8c7885d512a89039835c0dec0954032c82feeccc0e57d03d24e6175ac2. 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/QZZ7T2450604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a3f7bdc30e273362b729b47c816458a340a4cd779b108f1e8e343c50e890a4. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QM3DF2417678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6172718aeafa446aaa23428b72b72729ff32eaa697389b3beeee62b3a09b21. 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/QZZ7X2492766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dee0c42e5743b024e0b81b7e73309713d5f5f9b32b30a0d0553e69ca189e9ba. 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/QZDA42551297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f7f7ae2e393bd7264b81d6ff22a4798bff7e5734f000e189a0c86d785aba44. 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/US3DF2526963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb69fb8fd71471d6716dd28185875e8a5a5b83982d07bc0abdf0d60d7519c87. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZHN92556544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966f27725926826fc62caf42ba8e764deb6d93f5995702361096619e8b1d0a57. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/US3DF2531390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac40c56c57f769b558cecba4e27efd7fa76fc18eb567015bcc77fdac189a217a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US3DF2536895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5785cec11fc1d778067a1f25ea71343cceb5e1d0a034a05b03a8c8fc421a7686. 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/US3DF2549153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0815aa4910f10cdb43805430302ea73c0e43759e01a04e705eb9f5c5d57714. 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/US3DF2554280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b2e057f0c9b9e4c02636954e0f27a7968de8901e85d4f047968bc5a6503d10. 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/DEZC62599427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b74b0740d24eaa5b22a3cf89c40d22cbbb53e4ad19eb43dc1c6a13dbcb39e6. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/DEZC62507980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f60335cc81900ee4ffd7df8272576fb6d4d56109d1c5d11eb0188963991765. 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/USANG2504416.