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 0xdae32669352a0169682f0ab34a6f5f4be2bf4fd2caef7d4709c7b5bfe3514d63. 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/fee305c8-f03d-4efb-a5b1-f0465648a8e9.json and https://artists.proofprofile.net/proofs/artist/fee305c8-f03d-4efb-a5b1-f0465648a8e9.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 0x51f8849ba77e4db5fda9409f703fc4fb61590ebf61057c8d86742d3d3c5481ae. 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/VNA092109345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac6681f91cadc2f545e1efd7b248601836a883d63cf4cbed78adb2aecce7ba2. 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/QZWBE2332237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4912f8699d45f5deced1da793bde9822e707d211264b5ba72bb52e1a1f849bbd. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/VNA2F2403180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac6681f91cadc2f545e1efd7b248601836a883d63cf4cbed78adb2aecce7ba2. 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/QZWBE2332237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc736cd2bda06c2edf313ddef9320633a634c201ba89e7214edc062ac49d27bb. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZZ662370899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167ba25d9d18e198291f05a7f3d54eda50a365f0a4a15a23c412ff8eaa61ddc1. 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/QZZ662370902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4c754e1a3381c23663d3ce3867debc7f25ea0c4c2e1b41ec7bcccf3ee96e70. 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/QZZ662370903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94d68ce4b2dedc390902247b7c7bbbecd64c02be3331032eea90902dc7127bb. 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/SE5BU2500461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8b373d461efd2b3e9a54dd6208ae3705090799fced621b55c1bfabd6b19662. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/VNA0M1940295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace3cbfd3d45db23a5c40c9f064feb3aa58f1a7ecdf81d3c0980b177feb2d2cc. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZHN42532288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057ffa389a1f0e51033ae9cf7d4c7989fe3bbb4fb8036c35ac32abd52f078096. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHNB2597077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74d627a44027f8004511ab3075c9a92b06eead8584e268a7b2482c3c591c792. 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/QZHNB2597078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e73ba0860c1e22457014dba4f5e838d772912e356b4fa1486f829759822d128. 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/QZHNB2597079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a8c08bc12e7dcb6122c376748d3e5f9e8c8ac1afbabf7285b2d519dabc1c8f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHNB2597080.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf6b69a2c2cbc1dccbe9e57963f9c1733f47a4c64ddc02a582964853c67f045. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/US38Y2546579.