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 0xb548c8dc3f5e8e1aaaaf722bdda0f1b2ad0c146f569af4764e83b6d4d314d8ab. 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/df471dbe-cb3b-4fd5-b3af-3bdd3f988e11.json and https://artists.proofprofile.net/proofs/artist/df471dbe-cb3b-4fd5-b3af-3bdd3f988e11.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 0x54e699bf406bab4369334ef5c3ef0704fd8b7b12b3a9c3a140b28115232c707e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USCGJ1569687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64948432240c379ee0c97e9824e47c61a9ca62ecaf428c8385b40f6e98f72a93. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGH1843911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46baa396e730bfbdeec860f922f9c8a55897df1d138cb5c6e2c612b4e6907668. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWS2373705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90968cdf3800c354d1953b7759276637157730fc76c1fc5fd1b8abb5244abda. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTB22366404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeec19538dea4f10bb69eca0654bedeb9daa2c3492dddbf12a528181a848039d. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZRP52374107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c6faeac27c0663890b636bac54f239e47e1a3cd1d190a594c5eb509e298b59. 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/QZHN62407036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd680bce75ce40254e1f0008c7e390dd86b6fe6b707ad035ef0f26ee79a6611. 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/QZHN62407037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b74995af61d66d04d6e3bf966d61db792b25e9d116807d3294f6b0fba88dc2. 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/QZHN62407038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4cf66889051e6835dd24188a4e3a321b7f6a7c728aba632ecfe874db62dab3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFK2498685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a676c635a0daa6a372d2347afa31b2061e7ad2a0adbd7fb810999c275961fa0. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFZ32594533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4cf66889051e6835dd24188a4e3a321b7f6a7c728aba632ecfe874db62dab3. 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/QZWFK2498685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d12a79ab88ee517bf114c4ff7b6089695dfb51aa2d1e17089f86fcb79104a02. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB72425294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a676c635a0daa6a372d2347afa31b2061e7ad2a0adbd7fb810999c275961fa0. 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/QZFZ32594533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4cf66889051e6835dd24188a4e3a321b7f6a7c728aba632ecfe874db62dab3. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZWFK2498685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323df04a2605163a5f7e7932e08c765b8cdd1d1ad8387fa3403f9ce81b337838. 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/QZMEN2534557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9577753ad02103c2ff0fae8c177d797d9488c8f6ede806987b28c6eee30fca10. 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/QZHN92543799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a676c635a0daa6a372d2347afa31b2061e7ad2a0adbd7fb810999c275961fa0. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZFZ32594533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4cf66889051e6835dd24188a4e3a321b7f6a7c728aba632ecfe874db62dab3. 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/QZWFK2498685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d12a79ab88ee517bf114c4ff7b6089695dfb51aa2d1e17089f86fcb79104a02. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB72425294.