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 0x5459a1179ea6cff4da5059c35a1c763908c890a98a81c3b3da3c6191406c1548. 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/6323b65e-b7f7-4fa1-8c75-3283f25ad708.json and https://artists.proofprofile.net/proofs/artist/6323b65e-b7f7-4fa1-8c75-3283f25ad708.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 0x44c1a4b1e09fb886d21cc1298dad708240ae6b19a9cc0bdc59bd88b9129f66b5. 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/QZNJX2097019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee1fb4500788dcf99ddefce70f4e34896731bcf09c3e39a06663891459392bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX202053281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363a2e132c8b147358cb04ccf5bcd268cc89fbd39b5f640f1ba5e6c4bc954adc. 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/ARF862200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9ac5c5432ca7bfff50bc4074010f37c2684ff75f6adf053b034911da886784. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BK4DA2307166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe328727874dfd92743fce907807b74960579b57da6e369a87cdd8f8e19ec9190. 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/ZZOPM2119465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fcd872e92020ecfddfbe781777cc3f5461803fe871580fa7ca2308dc3d58ff. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ZZOPM2110992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fca3d26b3b3ca953a215984e80bb92d831337671ff7213cbe43d2c823f5933. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ZZOPM2108691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce051e4df9990f36d9017d4cfe4d70a4665945b6b79d2705ca1ad5079f8f5080. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHZ62143393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7b6b53804ae0dcb0314ce0f69f6b0e9f267b5acfb66ae16b740dcf34208710. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHZ32156281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5553bd7676f7f72d181c3f9fd3b52ef29eed5a77813e49c155220de49f0b124. 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/US7VG2198836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76221a34cbf345a29fb0a7e59703762f54d35bf5136cbc435b9aa543e05351b0. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZ5AB2118537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0488f21a8356a133b6db3e416cc01b07d8c0d9a5b6ebcc0e1127ff0e775d34b6. 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/QZNJY2006009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc65127b832ec6c4b327f3df7ee87ecf40a56c74ecadbeb5413ac248202a0cb. 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/QZNWU2040532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0316753373629cb1ee45cc2e4dc07f4d9f892cf9717fc2cd488b392fa9c9fc. 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/QZNWU2050367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d5c24b099211871f524c98dda35d19b2882927fe30f513efce48012befe4a4. 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/QZNJX2074635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a2ad109cb20bfd3ce4b91095018e7d8b2abbc8fb8a509e18e821b39675d45f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZNJX2074517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cd60b803a66896307d3936a0272658ab383bb474d6626d480af0625bba3b15. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/US3DF2009787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e47e443c565f88af3d3d901b6584b77c0b43c1081ffa66cde8d121176ecd51. 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/FR10S2048553.