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 0xfb599dcad2077f7949fd21507baa3dc636e302912445f97332d82a7d33a0cff7. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4483e55b-94d0-4ee0-8db7-72af53b0b570.json and https://artists.proofprofile.net/proofs/artist/4483e55b-94d0-4ee0-8db7-72af53b0b570.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 0x12f5b768abc1bd32871678b420486b93b59685ec4ba4937192055ddab6372e79. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLC062394457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e96d0a208b47819dfcea8d3142f1cd333744f436f15e1380f9eaee2f81d4a8d. 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/PLC062370504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd13888d7b7716252b5d1ef70301777851ff83aa41b41de1ce2576c3b37e317. 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/PLC062367018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50998aee954213106d86d66665ece2826464c9bc51782ca33ebef9f3c9771fd7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLC062119165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495e91414adb74f8c1b7c14961951e175d12254967e9c0deaee82266227a57c6. 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/PLC062117584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a1f6f6d9c82c3e02325e7f85e489825393850d90fbf3b1a9112582af05413e. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/PLC062011832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706673257ad86cce220c99270adfa853711b2a401dc7aabab72c9a68ac468b14. 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/PLC062009998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0492f0619c369096a9b13a8e51bb1def3376efc81402a7e1d1ac8ac3775d27f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLC062009625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542b66d88025804fec87fb463cd71743484f5fce9ef1c7a244e31003b5f58c15. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/PLC062009623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730a1cec9e645fe68c485d7cae7311ba829fb0ab4c623558c4172f4817e8cdbf. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/PLC062009619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82963f723f309792a2284acf97a470dd7753b3528f893f02be7817ae577ea31d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/PLC062009621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47129e22ce5993b21124a98a19f60a343f1dfeb7c6823cefab5a864bc807067. 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/PLC062116786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eb16e0b805cf5f5dce3b0e8c797bc48059b3a176b91229b4f39c52ca94c704. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/PLC062116788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a549d63f2ae59c9583189d09f1eb116aedb21239f7165a3d4644c6c15ec4d52. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/PLC062116790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf14103997874735dd1631034e4ede9c6048eeb6f43d1831fc2504bece2e094a. 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/PLC062116792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12e5acb746b958150b9b4841a5d9287266045120f0432f1b5360de7d8b52ab9. 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/PLC062010143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7e4bfea975950941fa32cf705e8dbbab074a336ad70669115f61640d45461e. 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/PLC062010144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b4d8aca93698d39022360ce9d3c80bf6a2bd5682839bf99f8c6c14a80d179d. 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/PLC062010166.