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 0xcd6ec4a176a9d72952fdb8c6cdca2389c71048d3c9af088529c359b9cd429c69. 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/675b905f-f99c-42f6-a0f1-47e67caa2b39.json and https://artists.proofprofile.net/proofs/artist/675b905f-f99c-42f6-a0f1-47e67caa2b39.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 0x2a878b5ff4e034d520542626099a00ec0f09ad8fa2ffe69699d853b6e04139e7. 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/TCAFW2156328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fa23f3a00ef318d7ddefb40474201906adce5f40b71792ece6a94788994aa8. 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/QMGR32047868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838548166d26e3d3a21cd9c06a0ffd2f44059e7495b5f65aff596157c68fde3e. 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/TCAFN2121979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a253b3168c10705970f652d6a8a0ad0aac0a607063035fffa4d0591025a16eb. 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/TCAFD2023297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bf481b26877854af3bd34c43ef8f56669ee8a564cfd187536205929956744c. 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/TCAFI2191486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fee734d9859e2228ec0e1d342a2144d6a7d7726c81edf3fa567e1a5cd6032a0. 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/TCAFK2154055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357027f00977d656cfcfad2db1daf33259b8fb8ea7128d8481f1ee5b0f766169. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAFR2171828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356aa90b4d78186f2af26690ef3dbe77f111b444b5eb79cf9ec9882136b6e70f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TCAFT2115935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ca1b6a672c09ad58010a4377e04cb95579b0b2d3c64e436b7bcf937f803095. 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/TCAFX2189283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ea17209550313334b39e1ca6680dbe245dc1855452ca4fb8c069ac1e389d1b. 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/TCAFI2024291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a1967b1851b72e5f1b34626dcf5b97264f2226575d7c831a19b706003055ec. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAFK2185430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b226355cd5f7bd7dd4448baf91b4b0ff7b476dda20b2873aace9983d2d4667a. 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/TCAFP2124918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b31937486f510c5c8ad1683e568952c91154f45e554363b82a2de7777507645. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAFP2198320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2646a4aa4f3d6e70a1f2e59a989b9905c82e2c9c42fb43259695848b140920. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAFD2096946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa54e8d28184f3084124b897acf6488d0c2690725ceec6eddb03d3bc674b8247. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/TCAFU2194047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97da371c94244686d11655656d83837bda5ba6298277a7cc58f529ba949f1f7e. 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/TCAGD2226375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7301f0709ef18756b71d56f5a6b454e14401c7b18edbcd9b5d483c96dfba8f. 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/TCAGD2226423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536fdb30fb1c9d0dcec4b36fffe05885de027aed7e283ebb2ea00f64f746cdad. 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/TCAFH2088523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a253b3168c10705970f652d6a8a0ad0aac0a607063035fffa4d0591025a16eb. 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/TCAFD2023297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92354d2b094a62ad536d9bd8380cb9ef4ee523e4718a2ac046468c56b5ab269f. 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/TCAGC2238875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7023566d90111397be95cdc03433e7d8b57f61e1753a1ca7cb3b264169cc9cdf. 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/TCAGD2226557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ea17209550313334b39e1ca6680dbe245dc1855452ca4fb8c069ac1e389d1b. 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/TCAFI2024291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772bc16091fd258aaff6ecf2c92c39f0a3f998c094f5c2e7ec54ef02d40623f6. 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/QZS7J2387930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a8c7b6062f2e6953efd5ef02b53110d7b441b6acb7fb6da9d4eb90a836074a. 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/QZSYP2391985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de4635c7bebedf42d4f0019f9612f89f30bf340d20dadb1edc7f00b568f15a2. 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/QZS7J2369840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92354d2b094a62ad536d9bd8380cb9ef4ee523e4718a2ac046468c56b5ab269f. 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/TCAGC2238875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536fdb30fb1c9d0dcec4b36fffe05885de027aed7e283ebb2ea00f64f746cdad. 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/TCAFH2088523.