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 0x888825cdff01eafdfc10001d4802fb0eb0eba0a8a77c31b2c460766fb458cde0. 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/3d0e73c8-6258-4bbf-b2bb-ce4c8281ac48.json and https://artists.proofprofile.net/proofs/artist/3d0e73c8-6258-4bbf-b2bb-ce4c8281ac48.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 0x01cd67509f62caa1b625c33a1a76c03943581c98c75d3eaf7838b8065f81eb64. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USL4Q2157186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c3cc636684870ea1de5d78bfb3e4778e7a7d782e4ab81bfbc5e1dfe7f7b25d. 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/USHM92175128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98de9610583379949e9db4c5c6f315c7a67fba1f87b0e45301701265e2541b41. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHM82102529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f997498d3dd847ed380915f4f7e615bf7943233e67ab60ed6bbadddf1ffa1fa. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/USHM22152530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1e594674fae07ffdea586e6750ddf0f315be9cf8fe4b9d72a32e0c06b20290. 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/USHM22126579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e145bc9476097131a56a6de215247390c223d9c0791700f069fa801f4c11eb. 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/USDY42182326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e76f6da408c9203f855d7280f4bf979da92e50e404e4fd7f7ecc1075ce066f. 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/USCGJ2193687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958718eca3fcfed9c6a485b3792478ca9843049eb660b070d5d97141c10eb538. 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/USCGH2192331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1819c8d265dbab88752cf642c38f2223c207e92f2ad5cc225ecf3e8822dad3b4. 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/USCGJ2132197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9499d3cd1bafd0aabc6948e647b6ea4ebc2f6ffe48e60ac0e7e33ff5b10a04. 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/USCGH2155397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cdd390e1e7dc2038018e1075551c3e36b32b1e9f522ffc6e9c39cd23d2d44e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USCGH2199109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603f5af03bf7a070a1695ef253f4f84862f59996a003a762679a1849dc6827f2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USCGH2105823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967077503e2e01dd7945308103e2eabbeebe10d8f6de76cb41810bf1a1ec45b9. 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/USX9P2087832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e0959be81b95b52ca8d29e1a8b18aab766c54ef62726f435efd2c8b2bf9806. 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/USX9P2096999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb036ed15e958d7d78163cb95fceef3bec977461e56464d98f43808c0093e21d6. 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/USCGH2138925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28135e0827e79ee259446f3b78e3ec5fecdc1c2d63fbb95336cde04addd73a2. 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/USX9P2020976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f12e133cab2c52e9c6f3f46dc90fc206b29059e515fe3655e7818207ad8981d. 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/USY282012000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9717dfc9623218ae48ca40425d964aca38fa7fef9106573384ca54311d166040. 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/USX9P2021134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cb152edb9e62e225123884d6c5a5c991ac407a52fb374a6056bf13d388a6c0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USX9P2017827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0995813c96f376bb7a4b8740cbf39d4285041c6c61050c3a23691089925b74c8. 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/USL4R2090152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed59405c5fa5c29ae12bef9ebb2a66156d494bc02eca01acbaa4fbf13c645ae. 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/USL4R2086099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1eaae0df6e85aff34ec05cb545ac64c5a09073c10d1a8ed8fba7df234a216a3. 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/USCGJ2136988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972a972cfd2d12db0d7abcdd9f7130b933e3c644d78746afe29297e2a297afdd. 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/USCGJ2136989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e1fce7a39d2bdbe7930f6d5b09358a7581eb1660899a3956aa2ff6227ca3bd. 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/USCGJ2136990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705f4ea56b8617022cbbe412199ae0efbdc1f7cd014843fec24fc869fd44dd27. 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/USCGJ2136991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425e16a5bcb3544a9cd8168e76e991af4d81bc8ec843fb5c18663cad696753a2. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USCGJ2136992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf56c2a66c0cb9ef1984047b7898184e7c6c742b2b54d1c6802f718dfc38cd7. 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/USCGJ2136993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e8209ce8e9592ae4fd2f3fed5e807815cf5a0e54521099098b62565b3965d. 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/USCGJ2136994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a468712a23ca4660748104c4d3e5271ee6d1bee7411153513506b3a8a6d103. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USCGJ2136995.