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 0x02a8a3d7ebbef6708f2d89a48e597e3d4fdb69505b3b803e44688eb755494f12. 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/ac93f496-4a73-474e-a31d-9d5ac21e6043.json and https://artists.proofprofile.net/proofs/artist/ac93f496-4a73-474e-a31d-9d5ac21e6043.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 0xa19de2154bc0d2123c33f9ab28e8ac147ceeb28f51cb1c5bdbb16f7cfe77dbdf. 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/CZA168300941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1ce08fc4697d0b65bdabebbdb6adf6c6430045e1a6f1479637f523ff0d4451. 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/CZA168300943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d13e1701d687406896d9ed46b9ab91d066ea33e9d47a26cb74c21897d302ece. 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/CZA168300944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad568c0d5a6d3082c407e02613616f529b661ec030f7661febebff0b779e21fb. 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/CZA168300945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a17e24358f648dd62ca06dcebb6c1435077a369b1ff747d30c58e7f0b64328. 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/CZA168300948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b99892091cec18988e4fb311211e5aedacef3736896d040596888dd4cee11d8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CZA166800142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4244a112f9fbeaff2bd3425cbf6bec0c4d30fde62d0612e1e3da79bff55a3b78. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA168800310.
Josef Laufer Ve 1/4 3 (Josef Laufer V Roce 1969)
Kam Zmizel Tvůj Dětský Úsměv... (A Další Hity Z Let 1967-77)
Josef Laufer's Many Faces (pův.LP+bonusy)
Josef Laufer '74 (výběr z pův.LP+bonusy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d137d39738efbd32b532cef32ffcc96f54f19332659d70dc614379bb333b10a. 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/CZA167500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182a07ca7f7d93bf5a56d16d9c8b4862ee1f7268ae532143735e2fdb415a56c1. 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/CZA167700809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de9da296b96fe65ef76abaabc442bba1818eed58bfbe1c10e687f9a7d129b36. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CZA167800606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304f6883065918dc07a8220a112f791a59135f4c2a9229eb5d126db7825d6462. 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/CZA167900480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625fc437f145914ff286b32cb3d4a63c88afea0a5631ac6a4d35505f2e570cb3. 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/CZA167900717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad053ae0247cd27ccb1dd6c4093dfa5caf4ace1373931422b33989078bd02ce. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CZA160505244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b75e5411babfd2106dd2cc1c63c97a4962f83c663e5b2e4819330df4837bfd. 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/CZA168600029.
Muz se zeleznou maskou (Original Prague Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cd3134f8f5bd107bdee8623df92bd8d1557f8949c6f6094822111baa0dae9d. 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/CZA231700410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2350a98f266a43f2f0ac6dfe0fb939df43874244530f78703c1a94ea529a06. 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/CZA541219708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e85b8b3aeebf7ab42ea69c1c76b27e9713270268856cef9001401172b1b7f4. 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/CZA541219710.