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 0xd9fdb2d58cf295c867cb32130232823862ca0fd80b5648ea060594a7a1d6a0a4. 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/33f60e44-735b-4ca4-aa9b-e11912ae9364.json and https://artists.proofprofile.net/proofs/artist/33f60e44-735b-4ca4-aa9b-e11912ae9364.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 0x9f15d68d7bc43e7733c3d1c4d2cbc158281e7facdea69f591263afc252fa8d05. 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/QZZ432320350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3979aa46a636c3e27ca518d2b6bed16e6d98e5006b698dd10682902632c552. 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/AUBEC2508675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66803e7ff043f563616f7dd1d785bdb17bbd390f891062aa801e921592db8f21. 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/AUBEC2508676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0209508eefa8d61590b365e12af2c15e3c8a26694241434b81c5c4c7ef908683. 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/AUBEC2508677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa00586331554240e31a0850e18a0ba768f6986ab780fc39dba02fd5c6fc713. 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/AUBEC2508678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e45ff6312d07af784de54549f7b1f962e0fefd0b09b0cb3e3f0cb8252cc323. 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/AUBEC2508679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d577a3415fffc19f707dfe168030bc6336488a3f39ab83295e37d89f4209b9e. 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/AUBEC2508680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc7438e44c732444596f3474284edcb63e717fc7998858f53d24d99840cfd72. 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/AUBEC2508681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590ba3ed7c84ffd75a3626e5ab0ab7521faa8b51764b3f3b8726d735bc0f94e8. 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/AUBEC2508682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa700a901df1982878ab1029849a22b284c4fbb2adac2f6bea3ee95e7751a9db6. 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/GXF9Q2481974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611c656e81634b821971c9b1da2f7de1f07cdc2f3408dc2fb93db96ae6313f38. 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/GXF9Q2481971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e6b124230a3e490bfa1af826d7f2af5ee60c06809725672ebd27c639e1aa6c. 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/GXF9Q2481972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c68f2608dd67b1a09b618726b3ebb31ce14bf84f03d9fa1b7b86a4c81eaada0. 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/GXF9Q2481973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b506b2e8390291a24fef3b761dc355b069679cf80b08846be357afb9d1740ba. 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/GXF9Q2481975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e75086ecc44abf4340a5e9862b25f5d47b57b06b6d3e80744a9fc31dd94ca4. 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/GXF9Q2481976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3db5bb36153e98691dc15433b8cad407f78a0201a7a33025c4cbc0f2a6971. 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/GXF9Q2481977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140f5ab33c6b0974573ed8dd507865b2b492e1c53ddde9f7b363ef0add443024. 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/ING642507892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f5f9444f5f7582b02c39858e89f81d0df5e83825ba17ca3c07dc65cbe51bb2. 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/INE182577088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10283d8e9ddbb7da014bd4d6ff3e69ed372af3a5815c3350c51642986482d90. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/INN242537510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd62a73f007c83bc4cef0a7353c50ba4936f21cee86890717828311c738073e7. 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/ING642507841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4f41936160364c895d4fa1cfb87891a3f998ee7425ec87983cc144b3426157. 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/INT4P2301270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfebe11b054c703dadf87fd5879b22d492282728c10806850ddc6986d848df61. 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/USA2P2457661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6b9c69adb36d77a28b9f5c6fa5f29a9359e791941cfcf1e1c647f8be123cc9. 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/DGA0H2457295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38317d4f33b6b056f66ae1ce82d0511c575e8c5edc56ea6ac8eebca9cc7b6177. 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/USA2P2440367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf185c6b5f6f4f06b9822fc5b54a51febb90ba185bfc6ff9b5cbe2c3eae75b586. 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/INS7A2287745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf05371b9060a17e2e301880f6df364050c4e1989f7f63d845841412e468ba76. 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/INT1A2205298.