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 0xf83c4fef848695c99d24a91cfadf72af4fda9ba36f02197c169caf5d903beb43. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f55ef6a-59bd-47fa-9e8c-200b0daae71a.json and https://artists.proofprofile.net/proofs/artist/1f55ef6a-59bd-47fa-9e8c-200b0daae71a.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 0x0d09640c1dfead56b87d372ed102976ae6d530d80f5471e6d1ac7f7112607188. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAID2416931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b83de7f0a283e3363fb62b292cc1ffdf4f0fbcce9d55fbb74dbbebc439ced70. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCAHY2485556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f0a12024b19ed486b757e247ac5f6ea1a808c6493cab9fb0bd81dfcd5c6787. 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/INW262318905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc6bd365584fc496ec47d805a3ebe36d589db66ae42944b4045265d6431ee3. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/INW262318190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2450d6d6b5c64faaa38cd4241c32e98757e10aa98d62201aa7de1eea255014c8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/INSD11903927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7720e1ef8601714451a8ef3607577e855389fbc06345acea9d2b254a3bf6d8. 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/INSD11903574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92743d7dadfd94b1f196eb804bf71b20f06670361a3722f02d9311b2d0b6e136. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/INSD11905486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c82b96cddb668e7e658afbe0ebb256a8e30a7bda8a11bcb2130a1e98aeacc9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/INUM72300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6506a6bcaea8efc6abb24ab69b321216a38ad85b848821f8d64432b069ae60e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USA2P2260409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7c9ec16fb3627c138fd825a739a384839c6bcc9a849da5ed05cb3715f99d2d. 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/DGA052222274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadbfc39c2bf9f95f84414e93eb8bc2707190107e29cc9ba6bd033a485b13780. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/INSD11912960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985d76223fefc698d1b97f154f38394b250ed01ccb9147a8518f8a36b6663e80. 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/INSD11906174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f1979910c09736fa67532b3166bdbd7c3e9383e606ebcd7219962a74f5876. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/INSD11905122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ebbf11b751d39dae94f1473772080106a1842d74c61461b4bd87727f426597. 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/INZ031406747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d20dba2de04784a704796d58b96a2a8899eac569cfa127fae3d37398a93930d. 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/INZ031406000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5cd2bce483c12adea1d75c76f5de3b926516a291d41e22fd1f90c96f9d9757. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INZ031405022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d95ef501f4070980c65a8ae0b417ffd4ec3cabafd7ba0164a87c727924c36b7. 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/INZ031404290.