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 0x54aac4c22c969ff89150543701e53519146cad7481d964170c8879623e00de71. 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/1d3ebeef-e05f-471d-9ba3-ef93c990b357.json and https://artists.proofprofile.net/proofs/artist/1d3ebeef-e05f-471d-9ba3-ef93c990b357.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 0x2423b9fc4502576431b54dbabc6fb7f61546a12d24275a4ea00ce04f31ff3366. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZDA81801209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc628596d244455eeb90ff966f730f63db12a313c4ff7b3b71beb7be474e4674f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZFZ71914153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05a35be3f1997495e7953f298aa3ecfc2deff11181aec9fb7846c5e46142d7f. 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/QZHN32003496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4a8d4111e0bdd650764a0751b8fa25cb33ba5110dabefa12ff93834a35082c. 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/QZHN32003497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aa9c579612124db3caba4af6251e6f0aead90a8879953e343cf113893c4d3e. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZMEQ2060663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a617229eeaf826ddb51e5845103ec28155dc1cb65eabc4ce800c36df16aef9. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZES82153260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784bc6ff0e81419ff84fba86ba14cf4d7846e40983b277f32cdacfdd07b52797. 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/QZES82153261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121572da2515778cd74ab6949f5e40593497cda86022a1dd48e24d4a1ff65f3c. 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/QZHN62157373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae4960ae04f7ec29578e8472af73e0516cd0c6dfa5d37179a004552c35d54c9. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZMEP2117893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a54e01fbae48c40f026a069addc58cfeded35bceacd8eade09cf4df66463f0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMEP2117895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dff27b64c0248f8a681c2fcb57d2da889df8e05dbc35d4dd637e714cbd240b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMEP2117896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945e487b82eaed30a43118affdd22dd51e4dcfd93f8ee61ecdfd07528b3a0f7d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN42260834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910cf7f6371d9ebf137d062b39f3dff16f1a0bbb3699d57317d479081997b719. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZK6G2240732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a1175ecd955907c7b7d0c7602f7a1aafb23cff16223f611e1f9b0e545810cd. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6G2240733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c1709c218554f36175a07f9807eb993ef61c1697f23ca0bac47cc164cc5fa5. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZK6G2240734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e9841acd166cf83cfb9ef03c561b0c95d5ac644d97a79d1f58298feb456008. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN62383129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542f7a2d0bf4b15b3dd0303cb420616360546e2010ab8e5ac24981bfe2ff5f9f. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZNWX2385479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e24ff6871a538aafe9343ab6ef33832882f70910c441c47df4102e8dc7f2cd5. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZMEP2511871.