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 0x7db3b1c847e145379eb75c8615c3a5f2dfb4abf136c2bcb39f3fe09a76a15c2f. 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/1085b678-61e0-477c-9a42-59dd88aa24f3.json and https://artists.proofprofile.net/proofs/artist/1085b678-61e0-477c-9a42-59dd88aa24f3.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 0x42c991592fb98fe560306d387b515c8baf79c1e53908a059b36cb6ca36121080. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USHM91495515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d01f08ee9ac97bfcd497451e602d2c17b4f1e07ae2fd0c3f9d051dbcacd53bf. 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/USCGH1510040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32af33bb20e7c4cea0b9f7a9c3a8ad5240449c8fbc777024c7eaa902b33e1f66. 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/USHM91249428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e49dada05fb474111a359454f9b03f058d19d62ecceb831c934f072063d73. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US4E41742302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9cdfa22c9e846afdd49de3b0851d1a0ee1015ce9bc85161dc12ea39f422c3d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/US4E41742301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19d156421b898fd365f23080bd18bb1b1fdae0f5d1eca849755bc1f625915e8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/US4E41742307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7a5d0eaa6752a0afc905e99bceca9d27fc8cd9914b870cb7c9946d7b70bfeb. 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/US4E41742308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bd4470cdb575beca15674d2ed0619797b561148da041bed4a01cd99454d1ef. 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/US4E41742309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99714d1ff0d7d4655613768d8d0b0eb8a0051ebd3a7edde5eedbe1922a0d29fd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US4E41742310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642b0d133fbd93af2fd02cebdb546f9cc62d12effac4a16d633c56de20fef836. 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/US7VG1926440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006547941ed1b6087e44917c9d4fd5ded0500158af3b3cc17914cb06f0e38bad. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZGLS1936038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4fa69061aa12f30fea08beeaceababb82a3c68b0dcccc99b86ed6701ebfbde. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHZ52090702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd76ee0acd92cc60e53fca528f9096307acb2a43994d545b3e28bd75bf322ea. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZGLM2085638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8091be9c395cdd868414d734089297dd03e288496df56c600d806c2215e0a8. 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/QZHZ52090600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a1c45ab43387a0a70343573347844c9de67c934b1e050821213811e8ec2657. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZHZ42007350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fbb4f2a5ab3a5a461186ac891e446ae832feb23ecab4622124e9214284caa2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHZ52090704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e90dc02976d2dd3f3908fde4b3aeab6df03a2901ff15147f5465ea87c067d8. 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/QZHZ52090705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465b351ea21036be69c30a21bcaf9111e6a7609e6b32afe99a79992bcf12cbf8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZGLM2145935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78350d66f64dc4721a4968f3d1e7db911d45909c6c1f8be58a93f39f2f8c7d3e. 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/QZQAY2344744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefaa983c1b2945b5123d33f5dd64829043c5c9b5209daf6c1ec8b0a6bf5e2ffe. 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/QZS7J2336393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04884d73ab1bba3b04a81e36795287017f2a11f45e2c09d3a0334e2717d3604. 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/QZQAY2380762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d8a955abdcb3a20048fa627bb3568e23603d22de79cf549321fc3a01bda87b. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZQAY2305808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec1ddc013bc674d5f0f0ce09a43c540308953480758c4c3bae42e58a2e38db9. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZQAY2340531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9b5af1a2a57fe7c8bb2ba1973ac9cd121717acb1be0e508b8c260f0418279c. 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/QZQAY2332369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22190d242ee51343ce2ee4f10cecf6c282d39c7d2f22c3c7d6065c06353d1354. 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/QZS7J2496746.