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 0x37e3ed317e8b387acce38bd516bcfea5a6583f0a915d890931373e14e9cb362f. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7445693-3312-49ab-9269-eb18d059c0e7.json and https://artists.proofprofile.net/proofs/artist/a7445693-3312-49ab-9269-eb18d059c0e7.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 0x6d21f001d57e0be3eadec8ecf660cdf3fdf7fe9ab99f05630ba18bada63321cf. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZK6J2276841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b8b15fb94c317240cb1cec7b9bde5344282725bce677bb68e312c3b1b35465. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZMER2288385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff16610c1f5337bef434fd18833ff45e96e9249843b29e9338d3fdf0f9e3a664. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZTAS2200645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61a2e51b245317c17ef3212d510c8a2a5bf61a26105517e37f1b52ee2226454. 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/QZFZ62350856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26278ac6fb19dc3e3540d1680c0ee832394d1b12d845f564a2e50c3b7f29ac06. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZHN92306401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55fbb99c007d13092e5194d4706e9d5dea845c0a9640974cb3916cfaaba06d7. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZNWX2338793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6989717ef6a794156196eb814f852ee344f99b505aefa3427e5f08de4995ea6. 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/QZTB82342317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba516dbe5ef5333496d59a5fc387afa795445e588b68839ce7fb2431e85b9fad. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFR2374734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fbff1c50c498d60b86a6ca53adbf0d0b3131eae4761c261473285378c20891. 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/QZES72463149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7a33728507d7a3b0272a83a613b5a160486b604d16e78cffb37eaaa9013ac5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN82441497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9faf4a64b0d3cea92757d369997f0c3fecf3e4cc369069d6d1e3db6ed10942. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTB82414280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090adf128b42cd34bf13a5cfaba5ab39bd100c275e014218ef827c2167d60607. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZTB92429210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3ec3a1af1a1feee3daf9a2d502f1be84eee002b62d6286715ddbfbdabe5c0f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB82414281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a5a10f2556d1a963b91a39683be4586253fa9d2d384f12ff339e10befd71b8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTB82414282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fbc2dc169f82c135dd9668c6aaece22a8fc55063bf6a95aa38b74aec88182d. 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/QZTB82414283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784e69549d89a3509cbbe92c4e18b28142a197aa536689aaf6167583677ff7fc. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZWFQ2436954.