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 0xa311a9d82fced8415ad076d82833c423e4bfe9a65b62b08b33b17fc40c3841fb. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7ec5e52-d44c-48f8-8da4-cdcb3074d3f7.json and https://artists.proofprofile.net/proofs/artist/c7ec5e52-d44c-48f8-8da4-cdcb3074d3f7.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 0xd373da76c798a423da4e0472d00b47c416aef1d08d08405d7dca247408cf6300. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USANG2252586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5798aae731c911784eb7b73916b49fcd8dd2761ff10a04b13e9167bd646af0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2204498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3908a350da6a2b8f24bf3e3ebb79e520755c7b6ce6680f5f0338297c2d91d09. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USANG2240927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8504bd4714e0c8c481165d9186c9331b93b79bfa9a3e5495adf2f35c4246ec0c. 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/USANG2275070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83475d9d0ef348aeaf5a4b14db19e4240a80eef110cad9ba05cc457cf976926d. 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/USANG2266734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048414fe3fede5b92206122f08adb9d810484a1fd652e00d483582b2e52967ca. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKZGC2407680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee51f1da3a67ee97c5d94fa3a5538e19b9ed4f794c8708e8db1b97908b6e0171. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BXDS92200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5798aae731c911784eb7b73916b49fcd8dd2761ff10a04b13e9167bd646af0. 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/GBKQU2204498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aa195c3ce1e3ad416a3a3319b295d2607e19efff32a9a33b9b2d437968090b. 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/US3DF2177903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3526cdbbc49b4582f50c5879422ef109d2595f46384004fc62d0436b747709. 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/QM3DF2474825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bf177cac5f224ca07a40dac41c3a494485b82f45314a8a43628f023faf9132. 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/USANG2252588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0b53fa2677f0a2776f950bf324d1ae0444f70111112a4da1e537595cc66529. 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/USANG2252590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d8a85de9e1ff70291e674a439ffe05b478823240f6bce1274d48ce3a5bfd19. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/NLX9G2300292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ef299b9bfdd32ff1b08f576e37037ae9866f1ac042975c81134be60acce10e. 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/NLX9G2300296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d8a85de9e1ff70291e674a439ffe05b478823240f6bce1274d48ce3a5bfd19. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLX9G2300292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08335b582c62c13a1cca8674403f35011b8698f5a8cadba5896330add0a7f71. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLX9G2200285.