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 0xdb7dfb7bc28973eb4edbe81a6411dcdbbdd951042383bbad13029274596c0eb4. 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/016b954d-0a91-41fb-93e2-0327ede4c1a1.json and https://artists.proofprofile.net/proofs/artist/016b954d-0a91-41fb-93e2-0327ede4c1a1.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 0xc09528b504c22d7c9e6fdc3d931ae53e7294627b3a8d1a5f0e96b4d7f98bc5f8. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZK6N2152867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b4f1cea257e961da0530c051296461ae9ea520c8dd22801bd33fbbe8fc50d5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA52462155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbaf53f7e55892904eaf4b4a2928ed24836c65893fdc43a5f0fdd2a175b8124. 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/QZNWR2127248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75b80573b270e1daba8a99e37a17ce3d75806a8b904a7b8310ed7c22e9e2f13. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZDA62234899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75b80573b270e1daba8a99e37a17ce3d75806a8b904a7b8310ed7c22e9e2f13. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZDA62234899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095e23c30cf2497a3d799b3057f83e589772d6dcea170b31fadf9a2629f8a218. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZTAU2289327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58e42c884a20c5b098a7d6615115af68be2496afc463a83214d232684e7bf75. 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/QZTAU2184229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c49eb1722cd5d33bd697e22adedc4b1b92bf65c3663edbd7144d852c7f8036e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZTAU2289328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b986d84e20d65b1d2c2ea2447c65912a73b59ad1334ee5e665d95d0f7da4d7. 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/QZTB52235454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7225415321ecde388572b106a2d3fbdfa5649f2a198970feb6a18bd8a748a42f. 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/QZFYY2341474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf72f59924954394c7a66aa0b24ee5e67df818bdeaabb68209b5b9a987c74ca. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM24S2301219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07adf00710f93e3d314c6bf137b19e642262aa8a09126be0563beff33418c2f. 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/QZHN82370173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4382467b4a1d20b3ca50d3ab9f4a91f8e0c0afcee1c012ee6e6ba5c79adce525. 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/QZK6P2376878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c311141c6c71059e1899811b658dcf80d4555d7e431ffc44cec52f2f9615a5. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZNWV2384687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71354a395afe7453a2d49977d884b7f92443b986c83ed0d08d530253772f7131. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/QZTB32358397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346e00f373d4914ae4c4bfa812b98443da64c86a344d96ff605f8c8b1980c264. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QZFZ32423642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56437a53b004fe6b476b1a4cd2f75055e83bc654e389170107d54e119764fd96. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T09:51:02Z), 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/QZFZ62411124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09528b504c22d7c9e6fdc3d931ae53e7294627b3a8d1a5f0e96b4d7f98bc5f8. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZK6N2152867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bd9a2f8c7c86cc58bf5ba8cccd8d03bf9b939813a0fb03b1fc0c82d56a5dd7. 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/QZDA82421570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a44f7c7788600243528a46f1d1fa89e8e330a01d36ee281a51bb21609331ae. 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/QZHN52446606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8f2dc627e6e15a8c4e92cc04a5ac4c55d4e2eac598642497936ef3ea6c6cc8. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:34:18Z), 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/QM24S2401089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4506869c7da6201899ae88f18704c2c67e19a785d991fb4c90f24b4970567447. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QM24S2401825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c6fd8da34f848280eb85db0e32da6df068895f81c5f2b9cbc67587c4ffe1da. 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/QM24S2401854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbaf53f7e55892904eaf4b4a2928ed24836c65893fdc43a5f0fdd2a175b8124. 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/QZNWR2127248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bd9a2f8c7c86cc58bf5ba8cccd8d03bf9b939813a0fb03b1fc0c82d56a5dd7. 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/QZDA82421570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09528b504c22d7c9e6fdc3d931ae53e7294627b3a8d1a5f0e96b4d7f98bc5f8. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZK6N2152867.