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 0x233e3dce8db2879ae360fd3d04672f2c5c808637ec1dfcf7cd5ed5d264f368e6. 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/3b712bb0-8022-4dd5-8a53-1ddb243a8f21.json and https://artists.proofprofile.net/proofs/artist/3b712bb0-8022-4dd5-8a53-1ddb243a8f21.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 0x1f927a35dd529d43bf3003872cc795912688b9423b1160d54926a8c02259f6f2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USL4Q2058573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0a52bcc784305a78eb2c52438c15d7e86b9ac868a779d5c4db2ab7eb1c08ec. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZZ8A2383902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a7515597eab1478acdeffe21d9a2b9dd11df0f74d16f645195ee344199ddd0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBRKQ2386753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c85adfacce4e409c9de74c1d0846f19c95d7b684ff40d56b11260964fec2e6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USCGJ2058538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fffc19ae34d5b5c47d68a50d2089bab453e48d0683f88d753863b9439c8aee. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USHM91918644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4bd0e89fadc1b689c9b18cfda1e61b786bdecbd559f771c60d680d66b9fce2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGH1996505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1865a2be08a7b8d71712dac7ba0adf592cadeab53e0e20e24f27909d1131f7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USL4Q1742139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23a5c891a1fc8f1fb5e8c80a7cccdcbba8a2f2f2ffd530f14a1c7c43b59b097. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4Q1742140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f0427579fa0660921c6a11d7715486997e2ffe0a161753d87e1c39d91510f6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM91733087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3b6679d0636e5ce5eb51590474d5416ef626d595673e28405227f3a9383760. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGJ1796209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6817f2761fc7f0708930df6f4a1c5c9858b4d51064e424edcac32c5f6bdf1b6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGH1746609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b064b09a4fe3d60c8dab781585c196bd4c86343e6bc70141e2cf354ab1c6000. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGJ1670868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6052146b0fdf2eca3401d24c05541d8224b85e9688f7d4b4884fffdc6466bf84. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USCGJ1670870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfda93977cae653d5002d9e6f2609cc03eec558f8b32b46120ebe01927131fe0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM21421001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e31bfb3fe0ec90310111e6b83d429d5988f6b2a2afc19b47c8eb79be6ad243. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM21421003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47dd2a3a5dcb84980ae34e18938945f4fbcbdb6beb895b21ffbdd539d88c698d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM21421005.