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 0x6695873e6d8cc1d7b10f741214cf862a0af76a86ffdaa0373043da462dbfb5ce. 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/751c8d5f-4d2f-4a28-ab9e-f7448ec2cb2b.json and https://artists.proofprofile.net/proofs/artist/751c8d5f-4d2f-4a28-ab9e-f7448ec2cb2b.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 0xd92eaf8d2af484057eee079bf8adc878f509034ee3405f14d410a6e5493bd8a8. 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/QZZ4J2400416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c1938a71ef7d0ee5f5dea560404a5d7ba72af7b043c00c80c999f5ba9c9647. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ4J2400348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8efc4f38189aed16212c262e3e4e5abbf886576d39cfba29a482aac2edecaf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ4J2400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ab40053361c01ac99209300e67fae99b6371cef4bb1b640f08befb52a0d710. 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/QZZ4J2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9228db282c2fc79f191c2528d3afad8750c10c7f444355a758b2c8f5f08d7eb. 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/QZTBD2348320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0a3329a88f5c0ca1a804fa3eba229a4cfc756c471871c0ac4f95eec6cb86fa. 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/QZZ4J2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b70c1c51443714e0879df77ffccc1637f2123670f7d9b34e33b628e2aa5d0b. 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/QZTAW2323376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5542bdd951167f45ab8823ec093180a4e843ac1b4dc28c062dc18f4b1bf82141. 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/QZWFF2339122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dada02842fe947d53c50f45b85582d9f64357bdc411a6c86c4adc87ffe3601. 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/QZZ4J2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ab40053361c01ac99209300e67fae99b6371cef4bb1b640f08befb52a0d710. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ4J2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5542bdd951167f45ab8823ec093180a4e843ac1b4dc28c062dc18f4b1bf82141. 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/QZWFF2339122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9228db282c2fc79f191c2528d3afad8750c10c7f444355a758b2c8f5f08d7eb. 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/QZTBD2348320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b70c1c51443714e0879df77ffccc1637f2123670f7d9b34e33b628e2aa5d0b. 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/QZTAW2323376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a24de9a05b4c17018f1d48cd5f9f864d2cd9ab700e5fe45ad9ca94ac10075c. 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/QZMHP2387233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aea612b72ecc4c1b521d04a8816df5fcbda841fab0f911c7fad8b6873c33389. 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/CBB7W2315850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304bf63f3192c73dffcc3ba49eef30502f97175d146e072164f58456c0d2545f. 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/QZK6M2340275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2173007b069227069e0d07fea4ad08483244052517e7eccbab3168287047e198. 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/QZHN82364182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c57c13b1077059ad3817e37be4cf663e017fd81e7b57c78b80413418e4daf5. 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/QMTND2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b17f7c48a8c743f758c5ff1f62fed3c21c87439d6b2db4b504a63ff35ad975f. 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/QZFZ42353072.