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 0xd71962abc9648705d085c9d7b225fd8db95f4a74d936c9d3400813dde4f3a595. 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/7bf4508c-7c31-4f77-8dfe-86bf8975e684.json and https://artists.proofprofile.net/proofs/artist/7bf4508c-7c31-4f77-8dfe-86bf8975e684.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 0x9ae7009217e7809973abfdec258d88e7ce5ef0230f424ce53d9e9f2592ff9adf. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZK6J2104760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b93e022622ab7084be389ec9b13b50e0ff356cb5419b22b08aa09ffcef786ca. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZNWQ2111476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3304cb6472b8fbb9067f99ca9b880cfbc322a838dfd21f00b711d2a72c8884d1. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNWQ2111477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f38159bee539ccfd2146e322996f9b987f35a395063247b2c748d23a9593d3c. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZNWQ2111480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d3ea065643dd4305e4797a60150341da9ad7e1499598bd2d1b2a144ebb81f0. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZNWQ2111481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e01972a8900bd3ed705ff1b2bdec4cdda78e3e1f645cb1c67731ce9d8631fa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWQ2111482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e5e2ed7611cb3ffec14b57d1fe3a1bc74d68bec5482f5a2f263116fcba9aa7. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZK6J2183626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ac2b5a967d7bd0184b3ebbe6f1ac798757dd85a8ffd0a05ff2e75450cfbd25. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZNWQ2111483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95431f919249449c812b0aee42e14f5d3b46036c6f485e37101bd22e6013dabd. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWR2220995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28c8352b3a9004185c2b724454f384cd7703ae708524321ef0b56b3ae37ecc8. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWU2277682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f8e1ea4c4d889fb185f061ed96c3328ad2621e2a14475a840d8760cc6d9fc9. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QMDA72224461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9474b52d2cd2518389a6d1984e181f6338c3a2219fa75ef2b1834564885cbd4. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QMFMF2218022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cf07d3fbba42c81283d8db9ae64b36eb952636c459431e007b55d245078fd4. 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/QMFMF2218024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70efdbe852864d2b7a5af2ddd200a90e4d81f38561c4bf86b69bb32204415e0d. 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/QMFMF2218032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b8f191105017b62fa186d99f01cb467d2d3bebf367f67f1bb2f8e2574ceba6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMFMF2218026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889589ce7c46e26e72ec7212760d3a0b407279d5f27400e6ea897591c64af2d2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QMBZ92375425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef9d68e0cb25ac989f7fa78575e7abd691df43a88049cf25a3ae66e7ccdee13. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QMBZ92375413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6175f43e4eaf96d99ee6aaeca53c9e6a56ed669406f477546e912508f8bc9a. 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/QM4TW2486613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d24553cb11e33697ecd72b6d3b087517039bb3b976260b836afa625842cd5cb. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QM6N22436839.