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 0x3d0d0561c940bbcc048fbd6393a2a485000094e3f72a2d6fe1e906b8c83b0847. 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/0e2dcb75-e3d7-4144-8ccb-b06450e06ef0.json and https://artists.proofprofile.net/proofs/artist/0e2dcb75-e3d7-4144-8ccb-b06450e06ef0.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 0x0f469b3bb1fd71824b4e9034dd5fd6e38698f278077a813e6ac41bbe956b8904. 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/QZTH92279682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de83a1b248aafef936c352d10cc9954240029f2c4cafc6ce20bbf6fac759928. 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/USCGH2137017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ee5ebe6ad71c9d0d6a1e207c341b325ecae4b0bffcd969f5e5c2423b37a0ad. 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/USCGH2137023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd230d815290bdbeeaf23eaf3158dc92c175546d089697b7a4e6ce5ce7db1ef3e. 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/USCGH2137031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54579dd4bbf3d5fa5e6ad76e259c208d8a8ea537f99ad3e04b5f5536045cb51. 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/USHM91973083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b6e2aa2f2429c3449ea9af9221b4c19857b3d7f7b97c7fa7ee35ad28d6f243. 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/USHM91973088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c5735f2f002dba98ef149cccebf54e0347a96da4565c9edd5caf2e4455c31c. 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/USHM91973089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e83f7458f24100fadf97654385100707043f7ac88166f96f0d9217a601cbfe6. 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/ES71G1633803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5f0d9a78c71ffcc42963945fb72ebf3451710390e630e9d06a2a05e6ad6400. 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/ES71G1633804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fe1a31060f2a4c432b82e7f886605da9cf0628f15b19971952dfb540d073e4. 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/ES71G1633810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1480f7779644d7ba1933b1f41ddc2e598af14d6217db0933d674b1f4af4043f1. 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/ES71G1633812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b2d4ae69a0014ddc6432c67b493e896ea6b825969c988477bd189f08a2fcde. 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/QZMHK2302237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24222599954547f36df9b6de913218485cee56bb6d63bf95ef9cff8f4d8ba842. 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/USCGJ2318098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75a17626d6aa6bd2a7ed16f7042c9966e2693e71afe9d6809d9b813e2219b8a. 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/QZHPJ2295651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c326989a7f4ef1d2859e53b5bac69bdfee1e3156c313d1649c1b50e6b5bc29c. 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/QZJRB2282691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef925bbfd00d83210c61b1f6008daf2f2e4ba2eb3607b1a65173510ff374715c. 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/DEX262000436.