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 0x44fbfbf59226992727d1e4738e56614b062c0702adcbcbc99377882f5f6e7fc9. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1e689cc-aaa7-4291-82de-180be7dc343b.json and https://artists.proofprofile.net/proofs/artist/e1e689cc-aaa7-4291-82de-180be7dc343b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mahler & Brahms & Martin: "Auf jenen Höh'n"
Mládí - Works by Janácek, Martinu and Reicha
Wind Quintet in E-Flat Major, Op. 88, No. 2: I. Lento - Allegro moderato
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 0xc88e462301be6786b4cb64953939882d8ae9185bdf72080bd52d55e31e298679. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/SEAES1102010 — a six-check JSON result.
Mladi (Youth Suite), JW VII/10: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddebf7b130329a14abbd30375bb3c9a2bde86c68a134926e55cbe9b7683abdc. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAES1102140 — a six-check JSON result.
Mladi (Youth Suite), JW VII/10: II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7754914b62859eca40df7fa87071d71ef451d1bb77851bedad27132e84ff8ded. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAES1102150 — a six-check JSON result.
Mladi (Youth Suite), JW VII/10: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49084da7a30f3c2c8ba157e7b0def25b536ac98a9d3c2836b736afc00aad671a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAES1102160 — a six-check JSON result.
Mladi (Youth Suite), JW VII/10: IV. Con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bb0356b2723d2eeffde481b158de61e84fc3d64431ef47ffcdfc41bdd3e7a9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAES1102170 — a six-check JSON result.
PROSPERO Catalogue 2024 - Our Listening Tips II: Various Composers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58635a6946d73ce59d31a0fbd3ea11e0ea36bfd9d00aba504f13e0597a3b6839. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEA141065904 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0e328a915de40d0ae28c6248f1bd9c9247422e8f3a3d802c47397745646096. 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/DEA141065918 — a six-check JSON result.
Kaprálová: Tales of a Small Flute for Piccolo & Piano
Tales of a Small Flute for Piccolo & Piano: I. Volne (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0158bbcd5565f36d8e3fef51907c36361adad29172141918f027b8dc3420a1eb. 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/CHE272201151 — a six-check JSON result.
Jan Novák: Marsyas for piccolo and piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20356875a99ff4722f3a4a74b8e40225eb379ded15f2e74d040a2f1f772b0aaa. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/CHE272201424 — a six-check JSON result.