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 0xa6535c0bf344b760795192c310a19f77c537b7e5c032c7a251affb99fd6a9722. 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/d1460969-af75-44fa-a885-31893fa67fcc.json and https://artists.proofprofile.net/proofs/artist/d1460969-af75-44fa-a885-31893fa67fcc.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 0xb4bd134d27a84d39ebc615af5c21d320df81b44fc4373c0a8a454244f3749a5d. 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/TCAEB1937716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9622325f22342ed0c32b243fc24374ddb16c67df224a4da39244786f7b9e725d. 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/QZHZ31922887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8486b436a856946dc0ddc559508950d3f59b5fd313e1af3cf661e712ca1505cb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNJW2060139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016a819fc5bad5cf2de548d1a4de608b37ccd93e24e29ee15850e421a4669ae4. 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/QZNJW2060140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b60e0be9ce4032120a1eb96b1e7af30e8a0406edb333f7645ec54eb6fd727a9. 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/QZNJW2060141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8f5227a6fa1084b6b2bdc6895573514a43f4e59b989ec60c42005057e75ce3. 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/QZNJW2060142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6551bab2f060abdeaec6f59e7ff5e7db271b149542402fb27c1e2faa93d39eb5. 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/QZNJW2060143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30cf384d30d071ef2b81f81032d88f6cefb2d47b17e58105858ab479169529e. 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/QZNJV2074738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf03d37490ba254fa83de69d99d85b05f38cc71cd89e08f810105f1932432ff. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZNJW2060144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b6dd9780e8a4a7f231c507f858db8ece13a7bcc7d97fd1aad37042f68d7915. 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/QZNJW2060145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343302c0058848f521838417716e1be839ca58671a8a9108bb2086349cfa18bf. 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/QZNJW2060146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5d2d8b6b3d52be704c421deb4393e803606c97b2833481f3834d29c0b7411f. 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/QZNJW2060147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94635fb25a7cae036e66aa93604c7b7ff3a7d07070a7a5a27947b9e2bb4684a4. 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/QZNJW2060148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad760b650dd153b608ba033318494029e63865f45f606381c33da7f82be9352. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNJV2028512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81e42e9706cc54011acdcb86735603b589bff274652fc2fc23758ae400236d4. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHZ42275793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbf67bc690a3438336c1ee82c7c10580310cbc9fecf3012fe1b0d95932ab1b8. 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/QZNJX2337703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef1e92fc968d64fc2d3a50a9cbb101a849b3d8b36f7d4878b6b5461ebbf7f56. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMZ92485243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef1e92fc968d64fc2d3a50a9cbb101a849b3d8b36f7d4878b6b5461ebbf7f56. 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/QZMZ92485243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5974f68a8f2c02b9923375a0422c5fcf91e937edc756a3cc306ba503a2c2799f. 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/QZMZ92547039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4824ce91fa1f1a6ffb3dcff45c144e001939ae19ee628297570823266bc00386. 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/QZMZ92393135.