William Preucil (born January 30, 1958) is an American violinist. During a musical career spanning several decades, he served as concertmaster for four major American orchestras, most notably the Clev
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 0x8d5b7ff76cb26f2cec852bc1b703fe4bd9c5b4693e891accc1b84bdcb77cb1d2. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fa9f97a-0285-4361-acd3-1c513ec221b6.json and https://artists.proofprofile.net/proofs/artist/6fa9f97a-0285-4361-acd3-1c513ec221b6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Histoire du soldat, Suite, K29: I. Marche du soldat
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 0x99ebc69c31f6b374fdbe88a07cb335c7d507b0443e21e114155e2ed208a446da. 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/DEF059607031.
Histoire du soldat, Suite, K29: II. Musique de la 1ère scène. Petit airs au bord du ruisseau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b9aafaa1b163aeef46511616e12836f31e6e50784503f4347644c75e5db627. 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/DEF059607032.
Histoire du soldat, Suite, K29: III. Musique de la 2ème scène. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3112cddac5fb17a2374e7eda24761c59b665578513b5e82233e6d71580b0920e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEF059607033.
Histoire du soldat, Suite, K29: IV. Marche royale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b7e7729508aa03abd2136fc838a2254f555292858c17966444e18aa2e9c3c7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEF059607034.
Histoire du soldat, Suite, K29: V. Petit concert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496a845fb1b92eba7467e24c8a4f12b4c4bb85e09f6ce2da327a1a9c3d1486da. 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/DEF059607035.