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 0x42d49eb38fd714c7deafd21e6f5590b6f92726635091df7abec281dca0c89984. 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/cbf94c31-23fb-4639-bda1-7ba7d3c2e4a3.json and https://artists.proofprofile.net/proofs/artist/cbf94c31-23fb-4639-bda1-7ba7d3c2e4a3.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 0x9049cff9e4ae7254e6df0b82de8d2d19ec0385f2c45c8ddf1074cbb0c6e3995a. 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/USMH92302848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11d2a8f222a67e88fb1163d15d9241935425fbb525ee8d7fb3645f24f95ff19. 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/USHM81331373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318203137d21a1e0efe6fc43af11fb86e5e131cb11808dfafb144f0892a9805a. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USHM81331374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4dccbf5e85cd1d0d69178c951c964eb87f0907c334df26af253018945756097. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USHM81331375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd564452ebb91a977d58ab75de2338f48887fa23c1c67992f2dcda1f1afc6eda7. 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/USHM81331376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8413c329f1e9ab8b9c3edd4aca2b78903e5bf69d9f0914d0548ac61a997ebc69. 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/USHM81331377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e6dbccd7321984f98acac0af041fe8650c2aa6811eecbba8b421ca30aa8bc2. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USHM81331378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce8d73562f36739208ab6a15f9be3fc864941a5aea924d966fc132df4c7bc26. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM81331379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45deb5ea8508878d8348363409c793295dcfd110283cab9f244d48e53f40f759. 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/USHM81331380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c7357b01d0b03ed6f13b4b787757651a1549383e7bd240b7ccfab0c6c6aebc. 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/USHM81331381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59a4f88cecaa9ee1ea32ac9226a84552514d4e862dee1ac37b70437a570b497. 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/USHM81331382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fba890ab0c7e045b8b14f03b66ea348fb5b3afc086c154e052e312a7ad48268. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/USHM81331383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d0b5cf2bab171af0d4b656f07b22eb44e3113700ab501f96fa42e511f47025. 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/USHM81331384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77343ae3841907a43d3cc0edfe52063b6ed9b4d4a701970e4473ee69aa47a42e. 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/USHM81331385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8618a6001337061b2a71c81684bf4028f5d5bca10220c75a8452ab32c082323. 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/USHM81743664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0120a11a93a2cc93faa70f8778955895fe731d19bf3a7868edb3ecba3998a5f4. 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/USHM81743665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d1a2e15fc6a70dc73779a8e80bd1d2fe13248e646cddf698892a150ed86bb9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM81743666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9886351e668843c9092f353ea4e48d1624018ccc7b5e08ef4cb0b0065e9e658. 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/USHM81743667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404fe4a8d60a47b0dfb69717bf84dec4b0ad3748ae6d2e3cfa96942610c069fa. 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/USHM81743668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5726a02bb04d544bd64ba38c46894255628f5e0425b1147a328c19d9e9f97e7. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USHM81743669.