Roberto Szidon (21 September 1941 – 21 December 2011) was a Brazilian classical pianist who had an international performing and recording career, and settled in Germany.Answers.com Life and career Sz
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90b716807387ccae47367746e4305b7ec04fa20fbb066ecbd58a68f4437a2d4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58767204-2f7e-4d10-a490-4a1460a6ba44.json and https://artists.proofprofile.net/proofs/artist/58767204-2f7e-4d10-a490-4a1460a6ba44.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Heitor Villa-Lobos: Cirandas e Cirandinhas
Hungarian Rhapsody No. 1 in C Sharp Minor, S. 244
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f610a8ad4821bf515e0f992ffe6347e1de4ce2eaa4bc8c806527c46e6b878f6. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEF057200020.
Hungarian Rhapsody No. 2 in C Sharp Minor, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a575c1d3ff4652a107d311bcffb04d4de0437166591021b5e47531cd25960b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEF057200030.
Hungarian Rhapsody No. 5 in E Minor, S. 244 Heroïde-Elégiaque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0d50ffdec7149628e896a26e94b661a36e0d8b3e1a5ffe6abca52715e93675. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057200060.
Hungarian Rhapsody No. 6 in D Flat, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e31c969e1baccf23bb1a1a1546e8e7bf71be57b692115a2f7cb0dc11345e337. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057200070.
Hungarian Rhapsody No. 7 in D Minor, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dbd60d2c4028aec82cd2b848994ae3426ab3774059af2ee8650d6110b7d133. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057200080.
Hungarian Rhapsody No. 8 in F Sharp Minor, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb6ba71a94ff351b261657902814c1c6c39a78f840ecc1827f6bb1836631b58. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057200090.
Hungarian Rhapsody No. 10 in E, S. 244 "Preludio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3617322c2e0bce14df9d84bf58cf53ed2ee58af5497d72ef525a8de484281a66. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEF057200110.
Hungarian Rhapsody No. 3 in B Flat, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58340f63322033f5b5ad9725f83641a02a267c68d6698271d0dea3173de22c6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEF057200040.
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
Hungarian Rhapsody No. 4 in E Flat, S. 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c977ab0037790608b99d8ccf943c0dab4aaf9958588dfa6b082e910839ec6c4. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEF057200050.
Hungarian Rhapsody No. 9 in E Flat, S. 244 "Pesther Carneval"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad202632235683dc0e0920ce65c9e607db1b219e6a8cc3811bbbf071dcbdfa47. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF057200100.
Wir Entdecken Komponisten: Robert Schumann – Träumerei am Klavier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5af0fc411aba4d57323739bfc71177e6c07235cb93fb8bfc6869f36346b6c69. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEF058331279.