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 0xe57d8dcc263376e61b4cbbe987ff01faee0d4e9944b27426fa5637c8d91dff3a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f9e8ed2-5e1c-4d61-a2a0-d6d2cc33a544.json and https://artists.proofprofile.net/proofs/artist/7f9e8ed2-5e1c-4d61-a2a0-d6d2cc33a544.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 0xf833578d44e5d4244c6f51b233234b86c685f03bfb9553826ea21bf57915c31f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6L2355044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da165d51fa7e64e5286c009481e4c0c7d6f5e1006ace8276bd3340be444c18b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZFZ62456484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fe1d0692afcafb98878a645fd114d06df2bbcbe9574cd52dedccc3d26f21fb. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZDA82425234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03108eb6c0e7843499254502d1df800bdaacb4699c9a8a5316654f3b9de8b249. 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/QZDA82425235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61fa0353900d9c225155b01ad9bddee6a0e88e669ffbe349a6f7f58677443f0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZDA82425236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d4971d964018a9e45391f8a7a26996750fbc993f9f2b8cd3c3f9e3edd31775. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZDA82425237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a50b004c18ab7b05ecbc55990968515bcbda968e5f1251887bd15ea2cf2b7f4. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZDA82425238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ff96b27d19b7c14bb037eb568cb1fa178d574d15426245715520b8661762a1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZDA82425239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9ef60d6893298c0747566a400d5e771c2cbb3217b969866f96975e4204ecf6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA82425240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68459ea714482c79a14899bddb30093c00dec3c43089f335eac0c0d66d15f932. 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/QZK6Q2448940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0613b9e9f780f387f18129c84f56a7bd082266167da5ede1f5a6b15037d482f5. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZTB82488896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f78d9dfd3e78650b00979c51ace327c2da5a41993a2f35713785a436f6c9c1. 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/QZWFT2410921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c9445381f0455794700e40bc59f29143c50d4569e9197abc7f0ffe0799a554. 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/QZFZ62569547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3e3483c21f2242f560fc69debec680fafe95ee52732f84b7e1cd3b74c35ea7. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHN62525503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c0c5b17a1f95b92be2072c28bad9504392ee8ed4f1b90b554b2c51758d28bf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN62525506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa409009ceeab733abca575d91bff9bfef0f68b7c7f9468739ad311b0e8f2230f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPLR2556689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adb4da963de9b013c825b1220e537a89fd9668b8b94aecee6855286fb521005. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SE5752379324.