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 0xa9caa10e607a582da5cb9b914e9c837bb350273800cc4e36d73d87aafddd5796. 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/4c685efd-fa30-43b8-9334-7517dfd1264a.json and https://artists.proofprofile.net/proofs/artist/4c685efd-fa30-43b8-9334-7517dfd1264a.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 0x0865c3741986d56b460e9d09077e31e56be33dab7796ac052ff59fab05d33c15. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US4A80500292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8345e4efcf8edebfc3be6bc7859e9ff26970800ed0b90ee95883f5bc6aeba9f8. 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/US4A80500297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55138af47bc95850f7279f1c475b528a302827febed5bc8796b0347f322cb6fb. 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/US4A80500309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad913e0ae154a01d719565360695c319cedc79ac565fe9ea0ab7c687dd31af6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/US4A80500310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039775088995e402db490581a88a25a5c13ef2285cc8fdabdf22c3cd33d66880. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/US4A80500311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03df631316ba56819cf4953bec9b9415d8642fb816a23dce5a4c25591bbbde15. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US4A80500315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be4091ffcc292cbf609c4583612e52ff42cded017dd5fd584ced2ee3d5135dc. 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/USA2P0504325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f61638337676acc4ff2affd0b4f62e1992fcb960440797aebf2e409e2384506. 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/USA2P0610174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9894c75e37a91fff79d37d8c5a47928ab94413b909096732e67bbd995f9e5cc. 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/USA2P0610167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454c1b1d3b943aaca8bf1131515c2bf169f5fa0bee67b7a5db7ced3475f4dc3b. 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/USASN1601493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb121e44cab83349c853c74b085e940f9b85ddefdbfc3ada4d2d7e0579959ccc6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USA2P0504322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d27bff7dbb26dc22974b3a7d0717c665d14e81e65deae1fc68848b0a5e7e1d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USN6Z0800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1be3ee0f4f9696cf244f992ed35a31783a2032c87432d1693e5352b2a92a5e4. 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/US4A80500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a78f4384687be21c5888a3d4b0864f10a8c860860715bf7a69e8a31c9797084. 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/US4A80500068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1479229e5cefe10fc0f71769a819dec4cd27c419b89d194413e7c92c0c4224. 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/US4A80500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeada03c00f86f4e969fc225b6bc23b9912a8de2f11c05a6bfd1f8d2560008824. 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/US4A80500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a90bab3db30c83490257ab4cdabd906ad5f1c284dd2ec6f8a94c79766c1a19d. 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/USQY51031066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2d55f6837e474271fba9219d39d1b80f1b476e78ea8591592e0feadd42835a. 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/USQY51031067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950af2112d5b84729cde5f19149c57d95462f6efaf8568f69a50b0ccca61eefe. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USQY51031068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2a41fa55979bdb872d724cfb3947738d9b8616b595c8d8a7629794b37bfbc9. 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/USQY51031075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a174a748efd77e17d0ccfa75c3a95fcd87fd8a774db7fde0b60591dd4806a8. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/US4A80500592.