Hugo Reinhold (3 March 18544 September 1935) was an Austrian composer and pianist. He was born and died in Vienna. He was admitted to the Conservatorium der Musikfreunde, where he studied under Anto
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 0x12bdb34e8d8b8158c5071cf8a5a3f106dadc85e8f11b94d1ef26efd5e6885e2c. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb172774-41ce-4249-aa2a-7e5acf85a7d9.json and https://artists.proofprofile.net/proofs/artist/cb172774-41ce-4249-aa2a-7e5acf85a7d9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Heavenly Harp: Best Loved Classical Harp Music
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 0x82930d6f9bea9b584320508698be5b27622d19a4130d6723a792472962af4c3a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI191801610 — a six-check JSON result.
3 Impromptus, Op. 28: No. 3 in C-Sharp Minor (Arr. for Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda9a7d50d2b879055fc03ab4592a179b2b04d559a84cd4a4496f053bccbf8c7. 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/HKI190154804 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe41210767a67e0635b09e56808b03bd66f8b9f9432a3d8307816b67b4253d24. 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/HKI190763502 — a six-check JSON result.
Lucia di Lammermoor: Regnava nel silenzio (Arr. A.H. Zabel for Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c41ccb0ede010f773eb1fcb0e22e5b9f571acbdaf1dd8a4983d16ebb0accd5. 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/HKI190154802 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bbc5c6ce6974e3395ff92a9d4a31601a78158fbab8c3ae2535685b4070f737. 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/HKI190341601 — a six-check JSON result.
La vida breve: Danza española No. 1 (Arr. for Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4dae23727ee722f76ff7a5b73d92a1d492e175b72b6d4fc3ac6ff4d47e57c19. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190341605 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd29da276233ef96706e2e43524f509a6ac0606f1d633c0e17072228868ad0af. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI190154809 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24080f41a7910477693fdce7da5b0e8f9b422ef12ec820588158d457f24a2ab0. 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/HKI199702907 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6127e2fc1cbac0a271fa3194b8bce78d882441ad8f7dfa1a84d5c6ba1e79362. 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/HKI190341602 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e4757378d93e205e86e277eef5b7e152e6a1f4de1cff89b43247963978b474. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI191804513 — a six-check JSON result.
Harp Sonata No. 2 in G Major: II. Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5557a5c780e393817230f0e17888aacffca8a14722ccbb9e950a1a56dc2a9d7b. 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/HKI199908904 — a six-check JSON result.
Songs Without Words, Op. 19: No. 6, Venetian Boat Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2b675fc3f930420197e3efa36f83ddee178a7f430b697bcc71faeeee8f6c2b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21944388 — a six-check JSON result.
Three Nocturnes, Op. 9: No. 2 in E-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dabf4cb610a2d6089ffe933b83002c53ee91272d3070d40d61c325d7ae31978. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USHM21944414 — a six-check JSON result.
Impromptu in C-Sharp Minor, Op. 28, No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8885c27a54e390e6f659e1195a060e63e637e7abf73f4bf91129391d978cf0b8. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USJLU0811700 — a six-check JSON result.
Piano Exam Pieces 2015 & 2016, ABRSM Grade 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbdb0117efa0442a9fb9c260e0d12890b3693a8e28f9db8b2a810bc8b476d87. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBEYQ1467501 — a six-check JSON result.