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 0x337865278f954b0477976c84d0163151d326ee5c553dbdceba6da49be7b12153. 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/cf4fe815-bdf2-46a5-95da-05dc30b00793.json and https://artists.proofprofile.net/proofs/artist/cf4fe815-bdf2-46a5-95da-05dc30b00793.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 0xc581dfdd74be846e0e89827f8013784e74f254e76198ed41a33b02d2e46c15f8. 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/QZGLM1956614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3727361c37bb4767c4c1c8b6114df8950c2a3e0ff322b48d654972efcf7e3ce4. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZHZ51988804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bb363976d0510d2ef60b5d2e7f645250ddb99d90444fdb4ee516a2a642a8bc. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/USHM22120857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95edec8a5201b7f7bc78496153d0d480f48f8cb665ddf19a28e70f6d196121f2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM82132381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62847611bff7adff5726c61f37cb34b1bf6a5039081f02974b6d5492d764a4cf. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHZ52208259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275e7dbb48d3aab717dc0260ef1e6985abd458da397188f288f704a24a9e9e44. 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/QZHZ52208261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97251225c482bfb6d31f18ac9d3316c12de9f2ec1813846373dc7fb51f2e086. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZHZ52208264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fedc625d4aae8052bef50f94d5ae0228fe3508648a8e51d385d633744d3bcc. 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/USCGH2313233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831facb994bf31135abafec5d048241a44e963b26202fe9f1c60b7990465c77e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZGLM2305062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddfcaa6ae05c21764cf458ddbc3fb3b66c9c8f658c343b84bccfd923e610214. 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/QZMZ92466276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0c2f5c5e4e411e8fe702793ef6ceb1cd99ed8d552bd4ebaa5633f8a64b5d66. 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/QZGLS2451918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b6a0899dc1cb53b73e3c2daceaab0761d5c1d118c04095ae2f27f6f70a3ece. 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/QZMZ92466277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377a04832e168de083a338dc7652ad5300c1bb957684a49060942f9d31616c71. 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/QZMZ92466278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fbc6982de911a5d2b3e68d95c5696f39eebbe5adfbc7fe90024e8e0ddd4bd7. 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/QZMZ92466279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0456ca7b57d4833e896c8466221b2baf98c755c517c2edc2ba145498f630bc. 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/QZMZ92466280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72151e0ab5d8888baa017374f416bd4831f31a5ad2490a9cf0cf7fa4520c75ad. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZMZ92466281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900ec1011a0120011b6838308cc86781b8ce54624e52cc3e1afce3a73cb06f4d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZMZ92466282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2456ae45d709c8b53cafe422a78a24f6604bf68cb74dcb376b1ad0f9a2344767. 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/QZGLM2427380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6937d58ece0d71cbdf0745455b440fae13422dfed5e7bd2847517380ab42b25f. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZMZ92466284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6bcde727d4bd07a0055dbb00673f53d6b8d4842ae74540109234e3ca839632. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/US7VG2579212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56f1ad067c9f73b524a65d4efc1434efdb221150da76dd224bfd41bf52cd112. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US7VG2550525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcad228caa8996f0a1ef82c89cb9735d6fc37efc20f123336447e3f9ff7c3a5b. 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/USCGJ2588920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbaf40b8dac6554a8d099eedbe018ecf7823f9b69a3a7aac1241726d6f1c1e6. 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/QZW9L2236696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7f0fc9cc09c7d96f00de4acd343d599c1ac85b593da0e0115b266c74c42f97. 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/US7VG2086592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b99374fdd614813c54f254be14b0ff352afbca8230b84e69ac8a40067088f8b. 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/QZNJZ2460020.