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 0xb79ad8e4aa390554e95b815ff0f1a62bfba9a4fe592b78563b0c8aab46bb92c4. 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/144fbe48-496d-40d2-87a5-02745cb7663e.json and https://artists.proofprofile.net/proofs/artist/144fbe48-496d-40d2-87a5-02745cb7663e.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 0xbb0be8fd8fe9e6d2157ce442329ec3b3b6bd5c6a5bf49220023ab7358069c116. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QMEZE1942655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0be8fd8fe9e6d2157ce442329ec3b3b6bd5c6a5bf49220023ab7358069c116. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMEZE1942655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b69350609c3c074c7dc5e87e419299ba7cb8ccf0e3bc4685dc6e210110cf33. 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/GBLFP2047759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b69350609c3c074c7dc5e87e419299ba7cb8ccf0e3bc4685dc6e210110cf33. 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/GBLFP2047759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4cd1556c97ff0f4fe09c98ba7d0d8b04dc35158f155588f102c76626d0c077. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAFR2169817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8652ad5b77c88102b535f2d58b5d11cc20f862592769042cc3417b2c8d58ace7. 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/TCAFZ2102568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f05b9463699b59cc428047505e777323500044d8c0b216aaecf68de428d8e68. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAGC2237834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd304085259507e1f4ec6aea5371e3a614b088fda2026c8375583c26466b408f. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCAGC2237860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf187edba926f1dd9c6801cae45b4937d6ab63f5e6a8a9ddd1da5fa4f1f234b89. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAGC2237839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152f05593393f1e59c0bdc07683b3eb27a5e00899e9a68ef748cdceb50c554fe. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCAGC2237843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee69c227b098669ec6bafdfcb4bb52b3a425158083db89b84c33d070fbc2985. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/TCAGC2237848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc4f7424b9eea2eacba2a05c61255ada9ffd69a9d2a1d5fcd8aabd96b8ddcac. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZN882373731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc4f7424b9eea2eacba2a05c61255ada9ffd69a9d2a1d5fcd8aabd96b8ddcac. 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/QZN882373731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69d81dae01e0d22987c32a1c5e654f6f21d6066f62ead981ae790995bed951c. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZZ662302965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3be80c7c305c1e09f12fb3f68006b917f371a95df4200a4bb670b40dc6fee4. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZS7J2488763.