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 0x69d532e2d0996e63cddaad4abb48d11407fa179741bfe923f981bcf067250df5. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b5da78a-52fa-44d5-8bde-a6ad8bb11e78.json and https://artists.proofprofile.net/proofs/artist/2b5da78a-52fa-44d5-8bde-a6ad8bb11e78.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 0xfb39351489b15d759255ff0b643f6d355cf0d5e6fb4fa31eb8a0426ab70d2595. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLH492400475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3f646c24ce7aec3d77b721a4a7ed63e7da643e70ed1635151129d1f3017bdc. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/PLH492400476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa9d86439c868edba2fede04200fee51103a854a72b6c4465030302f1ac293c. 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/PLH492400477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49adb6c9c327f3a00a4289146f49bb6142e04ed734e33e6c38243d7b9008ea5e. 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/PLH492400478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee27c4371529f86dfbb966d14687311cbbe073018363bfdf5f95d821ec7d7f83. 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/PLH492400479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5872c279a064d67484e6e063b4ffaf7a4747cbc64625fe55149463bfe9ae113c. 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/PLH492400480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25af0aa2e3809eae367ed40b488fe52e111a461667b6f12bc09748bf8a6dd57c. 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/PLH492400481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb6f12addd172d0cdab7257471d1aa896e6ef7da7c877211898617ac9c79a1a. 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/PLH492400482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f52289d64280c1a55b699396b02a9c2f48f0a05d17cc6f8acf54f13cab463. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/PLH492400483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce5048d8c2b59335768060e39d07673ca10c77a9fa3a25f5ebc51de01d2939e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/PLH492400484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefd8bcef9a96676e1cf4b8f9997441b9346b496f8231b7ef1714a706d25caef. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/PLH492400485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987754378d0eda4a29f0696489f0651b18d59627b91e7f0ae30f853b0aad5cda. 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/PLH492400486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2570e69e8476d6367c1b7341cf7d88129316d277cd598b58013e3145305864f. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/PLH492400487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf0bf76e6d9c83ef3698c8cf69db6aad144cf6edea67a1049cc1e0961e197e6. 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/PLH492400488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eff85460ea4732a9200ad7d65e1336d040a911b7377153c4353072a835cea76. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/PLH492400489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a253b6a33dc2561682177ca1c515cf02be16b84ff9f8ab474eb22e0e4f5fdb. 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/PLH492400490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09974f13a4a90342a6aa583c6e36461a9e4fd5e46458e230cbc8a788d343d0d2. 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/PLH492400491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf0dd666c2d472acaf4463858fb24ad6bea2b7b36a4e4c254e3bea8f5979598. 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/PLH492400492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb11c6c6c1e5f8906b1efe6f3a7c490e04378f8f38f8a9bf00eead5000d4a0a3. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/PLH492400493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb00f4384d45ff36e9b8524d4640257baf0208cf95694722d491c281fc4b83e2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLH492400494.