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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 0xa01fae1cafaa47fd6d432d6ccbd537e9f0ee2f774c4959bc3aab38cdbf840038. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b9cb833-f684-45a1-99e7-0d381e3fc291.json and https://artists.proofprofile.net/proofs/artist/8b9cb833-f684-45a1-99e7-0d381e3fc291.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 0x35fdd3ddd0f3cb26d0a802a41439c0e1b3b27b43e8f812d4bbb07305bfd7989a. 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/QZTAS2442310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacda937307ecb88655bcb7537f3b54ad69f83cf9f664f9b56db667b2838dec7a. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZTAS2442311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964eec7763b83fbc314e06c62e38a23c31cb6b42f7307bac3271521630a28d6f. 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/QZTAS2442312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1971126e5106732de642e7d3f56d212a0e41c4889a92267f9d1a2922c117aaad. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTAS2442313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4218cfa9a421ad0a26de6f5abdb5f73aa5aaab1eafa472391c4abc07b1b95f7e. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZTAS2442316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c2faacea0d097dc0dff7d05057fdeeb19b36af517df7eced2c63f8e61d861d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAS2442317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d58db5381b066f17a6023aa0c8d8afd365774414e009b2a1525cfd7aeb2418. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAU2462660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a48a7c3339243e860d34f286dfd62929c08549d72eec8a42c6a2796498f8875. 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/QZTAZ2491984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b8494ef29a046a3a122d1505fa74965d53faae655f7cb4b8355ebec5008935. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZZ7V2416081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be8dac5906c3a88da9c3de9c2787122177d32ed9acfaa55ec8e3186303e0334. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZZ7V2416083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3a96234b093c13fd60a86e41de517042be5366b4219cb8f06f3b17cf2ccae8. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZZ7V2416084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7fcf57cb0e21167047c80d83e29fb1285ba67ec99a7c395e9cc91985432819. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZZ7V2416086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef37b92aa81d39e460bf41a4889d45e4fadee5736b5726c4036a2d66920833a8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZFZ72596681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c01cb98f32ab08256af4766cd0bdb3fc4ca45cf866fc15f999f337ce3835e7. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZK6Q2546031.