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 0xaa09b1196dd5ea7ff59e2a1da7adb37df0e79edf25084fe90aece9af27aca0f2. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fca51c56-7521-4502-8073-2f6a3969ef04.json and https://artists.proofprofile.net/proofs/artist/fca51c56-7521-4502-8073-2f6a3969ef04.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 0x41c0ab18153a1a777d3c3e404a9a34f32fb4f996276de9e0805bbd15ba80c6d7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZWFK2312900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6010569796ae7ddbc85194630862aa16ddcd031d214e1ff0dc45fd0180495081. 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/QZWFK2312902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbffd662c5b5738438fdf6834ba5bac6cc8750cb51f5906e9c513fbbae4580e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZWFK2312906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64318ee03aded3d9d606ebfd17f2baec7c6110643d9024cf71296aa5f851e66a. 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/QZWFK2312908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ec2d896eb452df08ec9bcc6893df5f8e2214b61c48f682cf10806c05a2a71f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWFK2312910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3807dec7ed7d882900252060b4342981a91c3d172ae7849764f017b8569b9d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9M2337773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d3c6e81f12fe5dde54dc1725cef812c8254a278b1acfdbe0b620d0e2929e28. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMZ92468001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261dc99f8cb501c4a92523e7f23a4d8216c1a001453d35bd91f449537bfc8bf0. 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/QZMZ92468002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbb38b60b3941fa654518500491ce264bd4e3c8087030bf25705512f38c997d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMZ92468003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd5806d1255eae1a552029714118aed6d96610b291bfb676dae6a7397385601. 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/QZMZ92468004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929009f8c043a2de867021031c1ede000cc400017dcfa3f2230f16102d71e6d3. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMZ92468007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04095c0f44b4dec31b961414a9ee87b08b949a76c8b8625b62d15b116a922fe0. 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/QZNJW2491869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9cd34d0889cf974aabf0b805048512c4aa2108a33a3af492c4adc0608e6f5f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLS2207677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15a50eec52868fe958326a9e1be74c3c13927ce96a3cc40486e8ddff553485b. 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/QZGLS2288499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060051bb1777db08a352b75b9ede1fec934412a1ed8e4dac8b322238c4255c84. 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/QZGLS2288500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa7b413f59abfd5e0626fdbf9522031239d92038f3dfdc96473e26aa871aa29. 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/QZGLS2288501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48f065ac66cb8394494dd139f0dee45b5a187f951ee0dfa6f6b45c7e97694d4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZGLS2288504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57868196c41b746483e699db610636c3b7a14ac6c65d8fef1461ff04690ddedf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLS2288506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29924e270585eccc3be34e2f911e553f6d91f7c01a42d824ca4654f1573cb3d5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZGLS2288508.