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 0xc396a5da9838a030cd1410e5b2765a279bc01c9de75db5df7e93103b501e49eb. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5482fb3c-b605-4c3f-80b9-812e90fab8b9.json and https://artists.proofprofile.net/proofs/artist/5482fb3c-b605-4c3f-80b9-812e90fab8b9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
L'Album des Six: The Complete Works of "Les Six" for Flute & Piano
ファンタジー －フランス･フルート作品集－
Trio for Flute, Cello and Piano, Op. 45: I. Allegro deciso
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 0xcc12daa9dfd806798766ecd816ad48eb8ca24e5aa8d924119542d66433115aeb. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NLA460910378 — a six-check JSON result.
Trio for Flute, Cello and Piano, Op. 45: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a01be036cb54e024d9d8eeb11b47a7ad6e8e5d1747677aad4ff8f4fb2fbdb39. 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/NLA460910379 — a six-check JSON result.
Trio for Flute, Cello and Piano, Op. 45: III. Scherzo. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfe94f8a71645408205fa18d85961ea47e9ee363c66e984905cb947ef8e277f. 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/NLA460910380 — a six-check JSON result.
Trio for Flute, Cello and Piano, Op. 45: IV. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b4c2bcbffdd820b023d64cee18b3c1d933014b54a07b4efe4496bad54cf41e. 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/NLA460910381 — a six-check JSON result.
Second World War Masterpieces for Flute & Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf00f85f63326cda819bc256a71dfea81a5d3969271e098e805ea483c00808d1. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/NLY432100149 — a six-check JSON result.
Project Paloma III- Second World War Masterpieces for flute & piano The Netherlands
Flute Concerto No. 1 in G Major, K. 313/285c: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634e21b0054b63723dcc1a2d4ca64c2c9f2f038bb40c0ca3f88339ac3e673a5e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLE420501503 — a six-check JSON result.
Flute Concerto No. 1 in G Major, K. 313/285c: II. Adagio non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d366fed9c69b462a7c45c3b5b1b2d4b2ca627300787280d542fd10bbaedc3c. 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/NLE420501504 — a six-check JSON result.