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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115a9501ad1ff9ff66130d5b883a51e7d67868c2e25235e6153c69bed995a7f2. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d78c612-39a2-4c7e-a79d-f208fc81a324.json and https://artists.proofprofile.net/proofs/artist/5d78c612-39a2-4c7e-a79d-f208fc81a324.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36d0c025849752e8733e4058ff8c0c006af96bd84f1de91ecd36862bb8ed9d0. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/CZA169200135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b8c90914e1fca8f89eb1319c9d64c04387a105f40c0b6c57e1c0fc10fa4612. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/CZA541113603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bdd1043ad04f3c490daf6e69a04b0378ef4c5f113fe1ca50777a178300c843. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA659152196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3da2d6351a6d7158618215db6c4b2ac5070de9e6752acabad50c79983757b7. 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/CZA659152218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cd3e0331add9ff1ae28d9c7fb83588b891184640af61d3f30d900c1146e10. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA168500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cd3e0331add9ff1ae28d9c7fb83588b891184640af61d3f30d900c1146e10. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZA168500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cd3e0331add9ff1ae28d9c7fb83588b891184640af61d3f30d900c1146e10. 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/CZA168500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cd3e0331add9ff1ae28d9c7fb83588b891184640af61d3f30d900c1146e10. 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/CZA168500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94cd3e0331add9ff1ae28d9c7fb83588b891184640af61d3f30d900c1146e10. 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/CZA168500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fae83ca882deded99321f579d82b596db70271b09a60a2de52012955c73ce61. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA169100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e0766a2f1e113848e77b584b3faba4d86934ef1da1a9346abdb3dd6a9c8eb3. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/CZA540789816.
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 0x8a9ba38cd35c4c3e52659560d90e1b52d04a43452813cc5ae368279077e2461c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZA541008505.
Zubatá - feat. Michael Kocáb, Jiří Hrubeš, Vilém Čok, Klaudius Kryšpín & Pražský výběr
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5537bc98e47b384e4f9f3a8a2264a65f1dd2b74bbba7356d381be779b4e2c74a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/CZD711600037.
Chvastoun (feat. Michael Kocáb, Jiří Hrubeš, Vilém Čok & Pražský výběr)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73247e35e2aa0851288954623c3dbc1c5fa2ce6f40290929e563b5116261c5d. 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/CZD711600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aed977c38d88aff8563c351146d7f041a97c05e01da9212eaf641e135ab7cae. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CZD711600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7f8657ee2713ec66875e4ee5b0f355d1825eaf512971af5fdfabb14f689d71. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CZA940202001.