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 0x8a8ada7365f7f4c87c83fff12ce829d6cd4a171293904cffc6df324458d5882b. 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/544333db-4949-4a64-b964-f9db6efa299e.json and https://artists.proofprofile.net/proofs/artist/544333db-4949-4a64-b964-f9db6efa299e.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 0x36453c1b7ca778e529b1ac8a9da6902993860e4bb4dd95700f5c39be9e539896. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEEH61700386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f846353054a61a248f80216c3a621efd4ab60b216409d2a99e5098c168efef. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEE881612500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af9a719085aa0ab06e3edb4021b1d772c31ccf0356de49cbe21f11b9e2484d1. 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/DEE881612502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77fb0495a2348316c34578e8e85c07672bf9043474b1c4b233bc599f6d42290. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:53:13Z), 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/DEE881612503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a8b762a32865d4cb9aa66cd1f45dc005bde868dd073725cf9f2985d5f157b3. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/DEE881612509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1087413c157687517ce320ed4e66b29d7025da66c20afb05b0eeda12e375f0d7. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/DEE881814057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88839ce3492c716983cf8a7f2e441558b8a13ad3b7d3982cc319bb77ae0aa3a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:01:19Z), 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/DEE881814058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d4f78281f1bbdb32cef73dcfe16d17b7d6669d103d424078ab4976f169a9a4. 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/DEE881814059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a21353cf3dfd3902c30741c88c8b2099704681ab4b20ff8757ab88a7aff1f6. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEE881814060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9b0532bb37b137f4040d2e2abee538112f31c96b83a29dbe01ca4cb4038297. 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/DEE881814061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89f587ab71d5c3ca06984323b5c1a98db888c4f8531ae8699fa5f0b158d8111. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/DEE881814062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d73ed290eb099e2510f3969b3091d49215a4e521353edf380cb68a1a1b7223. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEE881814063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf668701fa91f539500ba4b57b031cf64fda3e8a1c34b0e31c907a6958c514ace. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEE882414338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e01259833b6e0970824a714ee72f5eb3d2ef332441dba395408fc124bf5369. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DEE882414341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf668701fa91f539500ba4b57b031cf64fda3e8a1c34b0e31c907a6958c514ace. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:08:00Z), 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/DEE882414338.