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 0xe95441b1daa0aac6974368e8439c792a5870da32b47335c743ce5d44d8727578. 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/2ee4036a-d68f-414f-8c78-bdc581c53df0.json and https://artists.proofprofile.net/proofs/artist/2ee4036a-d68f-414f-8c78-bdc581c53df0.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 0x085022500ad21298f851c2456c9046c533d89de3a0aba9d049189554cc3e4bb0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/CAF662100205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89971d687dc6b1ee330adb36958a2aae681b604d4aba3aaca0d9b357644a525b. 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/CAF662100300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa098849d84dd654fac8d0f766ca36f98bdf9896e511bf64d1da6fa1fe234ea78. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/CAF662201034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89971d687dc6b1ee330adb36958a2aae681b604d4aba3aaca0d9b357644a525b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAF662100300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa098849d84dd654fac8d0f766ca36f98bdf9896e511bf64d1da6fa1fe234ea78. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/CAF662201034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f96d74120edc21ae9215d0cfd6d8cc9ddc40542391820b6214c78435fe5385. 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/CAF662100240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997824d9bf76213477f31001948e68732607f216a25e99b236369bcc9ad713ac. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAF662301122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8abea16f5bb2fbabed31bd02a8a20d394ea27761ca2b2da442b3c9442faac1. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CAF662400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d79409ef79c307740ecc15e1ed601f189da9e9470d211e91c07be0447cdde3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CAF662400107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0612c789f3b01a9d2d0038dfc3e91b4600638b310e6d23d9ac59ee34d26a167. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CAF662400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf164e6dd4ce1bf954d63be1ecfee6e86eb5d060d0eed2f5e7335ff9a8640d0e6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CAF662400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd102600c70b78a80710a978a451ba34eabe84b9fafe01d15c61f1106797a68. 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/CAF662400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8abea16f5bb2fbabed31bd02a8a20d394ea27761ca2b2da442b3c9442faac1. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CAF662400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29db1affb88fc084312502697f91d06a0ed1c4d4e6c65de905cd2c51a94c311. 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/CAF662401001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd1e9700fd3c8c4bb8395f03010bf0e96985a5cf92bea96836aed1ec76e9f60. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/CAF662400134.