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 0xdceec404d0aea81e4a1b7e50be29070c522bc672ef239df4058c77377799442d. 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/af221ec3-4805-4729-8809-f50ff0b70dd9.json and https://artists.proofprofile.net/proofs/artist/af221ec3-4805-4729-8809-f50ff0b70dd9.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 0x8f5ddbb0ccde04a8db252c71d63ba3a4a24f315aa044384fe59e8dbef2af865e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1556928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9febc5f8ec8898dc7e6f4daef5f0d03e4d0baf5554c2448c18db6d06ee9adf7b. 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/USUYG1552540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07265ce92ca8247ca09a26f79a8249107f8ee985aa83b4f6100ecef88952ef58. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USUYG1557007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe435f1e0433290f2d10d5e25d50266aa7b1159b54a28d71210865d478e175726. 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/USUYG1557008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9441a7a2c2f7c3ea814f37af1d1081633213d7ffe4c730dc9ea41857866d6a1d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1557009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d77c2368f477981e6630186b9dcbcea42855fb9941e7cd6e46e911467d1dad. 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/USUYG1565611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6a477284f7e17942c3f67e70aebd91516f63cbeceec74d3175ade0a9ff1236. 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/USUYG1557013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22fa24ff49cddb7497482894bc6d9f6e9630b71a4fe2c984c43e62bc9a42470. 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/USUYG1557014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3c5170f5ba61d09c5ae8937b9a2bcb3f1c403e77b6f311c3191f83dfdb354b. 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/USUYG1557015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74e1d3148e3290e425c53d0681cbd30e968b62fd72553c59f0eafc10141b086. 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/QZLL92226073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e214192e6cdb24dbc8328b2ed77a4c694cbc212977b5440a1761b4e70131d7. 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/QZMWW2136989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda78809b50ba55b9de22ec287d4091edbc166b99ece39a3e4084677a708c6da1. 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/QZLL92226076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f75618d915e69ca8fe98e94f8e4be3cf482bdc419d7fd99b8fe3df09913f8c. 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/GBSMU4755987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33f4881467e9636e03624518e0161eaf257f5741ffc481d2f63b1601668e6c4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ85M1962496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022fd9671313770dc733c820ad795ef9df1fd4580b4bdcac074cf10b035956fb. 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/GBSMU5652628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6ce1dcf52b69356d920d5bd3061554208754f0eddf4ba58e55343d59d209ad. 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/GBSMU4482294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fff183e9aa6ecd639e879365126963affdf2880ee25c60e67cd301180c04d5. 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/QZLL92475020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6efb8be0a95decc4397d7f2905d8e348ab8fbcb1e8246b664b55a81ca6d713. 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/QZFZ32302420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715dcd3bde29c63073baa43f8bc8e90593c82880a7fa2340af1088804a473411. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEV2149259.