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 0x74ead407414ecfcde4b5368a92490521a2200157081dd9fe107adc671fa5f74d. 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/7c4f4914-1376-49e3-9d42-44df4f200c98.json and https://artists.proofprofile.net/proofs/artist/7c4f4914-1376-49e3-9d42-44df4f200c98.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 0x397ed2b62320f4ea1f210d9918c00bec9a8f163e4221a272dec4ceb17831def6. 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/NLX092200119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e273647b72fe474ffa99081f60063f1d9bbeda66842e456558dbb1e17a1f28. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NLX092200152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70f9b5f209e01fe4f8cbf7e7de6f6c23824bd804905e0f627a7175966d846e2. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/NLX092200160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a78d7204fd24f2bb1e1ba0f55bc4367283ae418d2a4917c2f2a3bd4ff89cb1e. 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/NLX092200161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b683044fc619ffb7df5955f82af6288f378091dc744cc89da5b023cf8d4f69. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/NLX092200162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073171b8cd3eea4bb447bd8a8af701eb52e0653f0ed94a331632a85020b61c63. 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/NLX092200163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e1e23b3eed0f166c5266c1787f9d5e8e50105b5a93c78e4896284c2666750e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLX092200164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a34f637e37ad461ba36a243f1bbce21cd74d7ab16cbdff870e7b551f2769b1. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLX092200165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf092d8abffbe23cb6df4cfb6f49fe5723043ca73dfbbb7a578cfd841a3048af9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NLX092200166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4698205fef98e98a4751038c2a22d44d81241c1dda97894adad9d401fdba3c. 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/NLX092200167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03669e618b6d0b8f1097e2161e26d92e3e6a924120584eddcd7c52ff3c2b92fb. 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/NLX092200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cebee4570353c12c29999c6457332a2f386807e57206baa823dfb4af7f63eb8. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/NLX092200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e9ad0f32d8cd76d6017d5c9fb1ddcdcf38316f62d8bc07bbd0aeb179dfc08c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NLX092200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0892520d249fe68e685602668526777c9352099d15c24b27f10cace2b2959c7. 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/NLX092300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265187931ce4f39c93d9dab7a43adc920dfb8e87adb38d58b971b2bb2b0791ba. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NLW2R2395336.