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 0xa6d13646de15894ebbf1dcc2f43472cece0e88a3f8d9eea76e087c9f12d65944. 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/d7e9c281-c412-46bf-9aab-a86a755594d2.json and https://artists.proofprofile.net/proofs/artist/d7e9c281-c412-46bf-9aab-a86a755594d2.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 0x380f268fcb2b43eac098ef66f81eb81dcfdff6dcade81b406cd62637e6b2b301. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ31971215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5f9fccb9935f5fd43189c472afd2b9272b073361e7c4f9b4e191c99d83d351. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFZ31971216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11112c7da41baffb49c2e1716852e6e957740539d1cf9e7a6a502cef8198912. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZFZ31971217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5919fcc089141d5f8fd6847252da27b0111cce9688884b5d58e74b67121b850a. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZFZ31971219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e34e2d68974784d8777f8a6e28f14303fbd78e6e7b54c09798077ebe3e6c0c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFZ31971220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252bb246d1b8c45443d93a02ab81201cf8ae3aab2b1a2f247c5c836ea349d2f9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ31971221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955f50493fe272bebf335a20439c995768b5ca5d1bcb5970e097430c31cbb2c9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ31971222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6667e503dc2a150d8c8b9f5098ef677767bf1098f6b671b5faa2044cb2202d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ31971224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87c742f01293244e59fff1c34136c6549ad14397c6403d70c03f5b9a5697849. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/QZFZ31971225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe23b7e992694350f13f1b941b2c451b6fca5ab92c4ce21ab87e10c183493db. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QMBZ91928296.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bc52b4f8d47288ccf504f7f53ee9f5783577bbe44918b0de0e0d78362566cd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US9CY2100250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7b6d41a0b928cb0803e7b1b88a223940531fbc106efa12b9b0f6e9129584a7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/US9CY2200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b78e38ab7b1ce0dd65e3f366b928091a8cb01e596a458f105312b3741339c7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US9CY2200151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e711078b94c18d384d8f1c667b50dd5519a43783127efeccf8f5bd8389507ec. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES62455904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d57b9afbd8847d82dc8ade7f641b467fa410b8501d9135de0b63238e2ef8b50. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZES62455905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b416daf70abea73559571b2d9cf19e0a368bb41a216d7c91615c2920f42839f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES62455906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c369885d53378e027835e555d7f77403e1169226ea85eabdc99df7825ba4e66. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES62455907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea2988db608fa27cfb30b05ef3e21558de5028ee02c6e2c53ad9869e7227fe0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWS2417873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4076bba38a711efc7a5b818df2ee66b9309eacf0786a21d4c879fffbf1f25f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWS2417880.