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 0xf1495030259684d2720644f866469fe47e29e3f3843eb2617a2bc34ff6986c89. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24bb4926-c1a0-4ad9-bb52-4329f6bbea36.json and https://artists.proofprofile.net/proofs/artist/24bb4926-c1a0-4ad9-bb52-4329f6bbea36.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 0xe1f10ab3518f9cb584240472484eab77a43b9ea8fe5a27c32de2bd72e3a387d4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN92430531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cb79feb20f0fb439a740faaf4dbe3d47cb544a9526eb23e8fe885d731ef04e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZFZ42343466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e576fa71a002ff77266359a8f615a9f7be41f3b50ec0203b123383da643a0f3. 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/QZDA62418759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6832b24780bf1f3f8ea31c153ced3743e5add8a1f48fc2ddcd4f4e759ab4772. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZWFL2301214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb81274e3a8301ae910bfbfa5fd7827d73c62d449ca66f3394dfce69774fd710. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZFYX2474276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e9d3def17f80f24cc74170e05577f4a7e2e07f6098d9d043a1da8cb505d876. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN42398876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a708ddf3a4748959b6b201fe4d8d7542844c2790dbcd9125d2289c57ed22529. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ22414783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f0ee239bc6e7e0f8eb92c4fd5422a5488fb7bed3bcd4c545784c91101f3394. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAZ2349343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07190771402caf7bb177bc0bff80b4da781928d47ddfd82fadff9cb9db9acd8b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6L2387725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bba9236348a9c8e0839cd17f79de630b8565aaff7c6f2d869e415c01c9f3fd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZES62311838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356431a0380173dbc804ff8f734328c886ec1a56e1c3929c82879b01ab2a8fe1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB22429809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedadb969e9dee00816046057bf96a45f6b2e57320929baae47753c930c7779b3. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZRP52410349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efe87fc5b0475563a679c89cbe15793e0d5e194cbdc39b95767e5ca97402509. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWW2490509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a6947a55391d64b70fe95b8fe80c4d92de9b2a3d53fbdf2e71551028ed8e66. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZMEN2415263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e576fa71a002ff77266359a8f615a9f7be41f3b50ec0203b123383da643a0f3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA62418759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb81274e3a8301ae910bfbfa5fd7827d73c62d449ca66f3394dfce69774fd710. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZFYX2474276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509a11d046e453a79d3a611cd312ccf52a287339ddb79fe7bbaac841d9995417. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6P2382577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bba9236348a9c8e0839cd17f79de630b8565aaff7c6f2d869e415c01c9f3fd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZES62311838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04866095f77c1361ed936f5ee8ec7e9f28c6ec578061a852f4f51dfc5f5eb30. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZFZ62384165.