Jan Van der Roost (born Duffel, 1956) is a Belgian composer. Van der Roost was educated at the Lemmensinstituut in Leuven, and followed further studies at the Royal Conservatory in Ghent and the Roya
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 0x702f9d15afd48e5d80dde8601011d4d191c161e7360e747a5cae0474dc1e121b. 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/51b0edd1-7d32-496c-adbb-4a38e5ad88ba.json and https://artists.proofprofile.net/proofs/artist/51b0edd1-7d32-496c-adbb-4a38e5ad88ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
In Flanders' Fields Vol. 39: Jan van Der Roost
リクディム ''4つのイスラエル舞曲'', 4. Con moto e follemento
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 0xcdbaad7edb5bd4a136350d72c50d686864757ee78372ac3fcf29d16542f1df1b. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/JPG200608071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b16c0b2719cd9cc9db6917ee28438114f965abd3bc20ff5a7054fb91a4046d7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/JPG200608072.
ROOST: Sirius and other Works for Orchestra
Van der Roost: From Ancient Times - Sinfonia Hungarica
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee77ced3c2e0dd116dc4cc6194d62bf1fc67c470534157ecbf27ef3ebcc9134. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/HKI191513601.
ヴァン・デル・ロースト&シエナ・ウインド・オーケストラ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f2c2e8a06721a7d650bb2f7aeeb991eacee0fc0b7f203a94eda411cd3d28c3. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/JPB601701596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abf313624e4a13de1af3333790a1e0d79939475d8db2d6ed677aaa71dbe7735. 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/NLP711700068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e93b03cbdf6f409d8a810fcaa3b507b534360b201d62d6847a89a2482c1e3c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLP711800008.
ヴァンデルロースト: 吹奏楽作品集