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 0xb3ea912e94088db9c97962dcab9932b64868d93079685fcdf74a7f131532c001. 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/1a98557c-80cb-4357-aae9-ac624f0c1134.json and https://artists.proofprofile.net/proofs/artist/1a98557c-80cb-4357-aae9-ac624f0c1134.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 0x246734d9d1c7e3cad43a20b5a56126811400e0c5ac666f4bfaa005d6879d7cbe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN82271656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8fa3a281cce97aab1cdb435ac7db6b988e9e467cdf894530bacd99effae314. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZK6G2269763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3f453d0b260d18e27ab7a2d6f6f048e9f988b973cda8cb82fa3d7a0ed48a82. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDA42317528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eff01cc895bdc8ce86206a2778f27bd7b54b14f4dd480f8e454ea5801380da1. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GX8KD2399025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4961407efa92418fd65ca51ed8e1e0fdaef8fc8c3150a268dc03daa0bb90b7e6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN32347245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e56537c208d37913a257aba2ceca3d3bc9003f63d27d689b4f3069df856011. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZK6G2395637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5f11b4468a9e60c8a5b4dc3b7d270718ee48b55cd088c696607d52454512e8. 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/QM3DF2289942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef875454544356a67420b17ae2876a5f042ab33462932f2fcc40d78a7d45b1e9. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:28:22Z), 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/UKZGC2403680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10135c3cd2992cbab7f72d19550fd4f4bb804940ef9dcb46c4935fc0bb5644c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZPEW2463445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860a854c825e74e59a43b7ce4552a31a296edaa1742a1c3cc9eae7791d500a10. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USANG2462157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda62ca6225e5471ce9e98bc6f94b390ea0e1e13a76aebe5c3db8e33e9e97db8b. 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/QT3F32480263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4191387ce2722a04fb57cfe80f8c02740a8d5611de6d6f4174c0d09263396feb. 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/UKZGC2501924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7425a0315cb3bd997b663d7247071705ff5a655040e656ffc7a1ff8a346e11. 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/UKZGC2404964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4191387ce2722a04fb57cfe80f8c02740a8d5611de6d6f4174c0d09263396feb. 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/UKZGC2501924.