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 0xc5e149bef90960497845d9f8473e930d4a248c35b61cbda38b5b306a882d3915. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c879461-0f7d-4cf7-b318-4a35212f6ce1.json and https://artists.proofprofile.net/proofs/artist/4c879461-0f7d-4cf7-b318-4a35212f6ce1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Jiránek: Concertos. Music from 18th Century Prague
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 0xda37a3faf9cd034f9776e09b9ac3793881aa11261fd180b29a94e39304ede6bf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161602349 — a six-check JSON result.
Jiránek: Concertos & Sinfonias, Music from Eighteenth-Century, Prague
Concerto for Bassoon, Strings and Basso continuo in G Minor: I. Adagio - Un poco allegro - Adagio - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae80f99c1fcc8553e879db12e2667feddd78256911b94dd2ce0f97206c085c5d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002761 — a six-check JSON result.
Concerto for Flute, Strings and Basso continuo in G Major: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c6f0a779e94545e153082213dfe73546e306ec8ed4a22b8e9acf8add33ab1e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002765 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b9a638592fe204faf9bad029d1a1fc727ea93c8536bb48a3300ad9ca07ac26. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002769 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11ec03fdc5abdfdd552f10fd674c18417d60226d3c5f64f357b14cf3086b76f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002770 — a six-check JSON result.
Bach, Quantz, Benda, Kirnberger: Solo for the King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f09a418840729b611fd38546b4ec4c6ca4f880f7b0f086412d8597ff499222. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161800383 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193a3f38d79fab3c08281dec81d8a24ac5c33d053665a1082ae52e4cd89525bc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161800402 — a six-check JSON result.
Zelenka: Sepolcri. Music from 18th Century Prague
Rorate coeli: Music for Advent and Christmas in Baroque Prague. Music from 18th Century Prague
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c541afa9e272b4055a711103a671e2a068ef1ce7f8132dfcb7869445b96d26. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160901492 — a six-check JSON result.
Sehling: Christmas in Prague Cathedral. Music from 18th Century Prague
Leopold Koželuh: Trios for Flute, Cello and Piano II.
Koželuh: Sonatas for Fortepiano, Flute and Cello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9a54b26431ed96bc50ae555e4353c6552c228234c6d0bd937e11e3b4e37b6c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162101506 — a six-check JSON result.
Lamentation I for Holy Wednesday, ZWV 53
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de76a273f78226a57029460644b75a7a4ba6ebb838009d025f9e5100764a973. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500174 — a six-check JSON result.
Flute Concerto in G Major, Gimo 293: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7097cb3692e5e0aa98e5036ca1bbd8e72092389499bdfb0a0b5dd7bccba9ceab. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500176 — a six-check JSON result.
Confitebor tibi Domine, ZWV 71: I. Confitebor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb3ab406c66124bc6b7d826aea6c17b70ca1db9d30888b57927d5c14465395b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500180 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921e1b779ab99f6a93e90400fa68e9b0b146eec30d1e48441235d96a58450277. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500183 — a six-check JSON result.
Salve Regina, ZWV 139: II. Ad te clamamus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e590177e57654ccb3e29bbf9a641cfd8358e295793bef57ab6eb0d3375ba885. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500184 — a six-check JSON result.
Händel, Leclair: Chaconne for the Princess
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918df2a1a783835f9ca1e7255ebc57c07e6315f7c86e820ee534a04829387f79. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162000233 — a six-check JSON result.
Zelenka: Confitebor tibi Domine, ZWV 71 – I. Confitebor
Zelenka: Confitebor tibi Domine, ZWV 71: I. Confitebor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb3ab406c66124bc6b7d826aea6c17b70ca1db9d30888b57927d5c14465395b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162500180 — a six-check JSON result.
Leopold Koželuh: Trios for Flute, Cello and Piano I.