László Hadady (born 1956) is a French oboist of Hungarian origin, currently a soloist and professor at the Conservatoire de Paris. Biography Born in Békésszentandrás (Hungary), Hadady studied music
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 0x70cfce56c36ac14b92b788dce5d3278693bbbeabd0c7beb2c52e70cfe024f02d. 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/71bbdf87-3506-46ab-9717-7eae5a397c4a.json and https://artists.proofprofile.net/proofs/artist/71bbdf87-3506-46ab-9717-7eae5a397c4a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Boccherini: 3 Quartets for flute and strings, Op. 5 - Quintet in C major for flute, oboe and strings
Pierre Boulez Edition: Webern, Varese & Berio
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 0xbc509986f3663e496d5651ef61f5f4104e058cd0464ab78fc39b25111e56e096. 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/DEF059505290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8242ac859bdd38a0de41b98018332a14f16f5e054ba3595c12eb0e3eea0532b3. 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/DEF059405100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fe19fc87144040127f86cc0fda2dd022c42eec49488bebc20cf20079bc127e. 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/DEF059505350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8756f0855bb8990c6949b108b34f80d947d59b8a0a3b7c9cca71605896d02e1. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEF059505300.
Sequenza XIII for Accordion "Chanson" (1995)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ede1117de7a23eefd0d5bf796f4e2d78fd69da2d5358dfe016273b722a2316. 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/DEF059605990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa45042d34af29a52e7b1bf510c9a0471fa19a1a04cfe83554a082bd97ecafb. 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/DEF059505310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d60c6c99cbf49422386564727d7ed81bcf8b506c5a1bf5f06b04cc391021211. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF059405090.
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
Chamber Concerto in G Minor, RV 103: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088ccfb642db57ea80ef4e099fb4ffbbe4df6e3be13ffa3fa33823f368e16f04. 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/HKI190423303.
Chamber Concerto in D Major, RV 92: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943e9dfaf2d89754ab9cf6418c5cb1d2c37e5ba2005a79b38958c3effbd0c0f9. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HKI190423304.
Chamber Concerto in D Major, RV 92: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25ce729d00159d76a06347c55eef4836942d09eb7980f7af46468fc41067ebb. 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/HKI190423305.
Chamber Concerto in D Major, RV 92: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff0d00f32e6b6804c0bf4e5ae7d5dd9c17dc488aeb1f9daf4b9579fd287bfe1. 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/HKI190423306.
Chamber Concerto in G Minor, RV 105: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dfb83f040807465c9c939f7c39c1c1ca99e9ec4796171549bd5359cb7f2ec3. 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/HKI190423309.
Concerto for Recorder and 2 Violins in A Minor, RV 108: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abc01333c4de4648b2adeee68052b598d66a639a2ff7c407333c6a43d234da8. 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/HKI190423313.
Concerto for Recorder and 2 Violins in A Minor, RV 108: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb039f66bd7a5653a3361f3745d0d452ff0a6ff8238392f66e981a01685ba4c58. 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/HKI190423315.
Concerto for Recorder, Oboe and 2 Violins in C Major, RV 87: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894edd1bf94b8dca21c47577a8506a547f8c9d0e1ed53ddf629ae06dfd48892b. 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/HKI190423316.
Concerto for Recorder, Oboe and 2 Violins in C Major, RV 87: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b14e8cf8f98593e97df99c915657268083653cd82fe25da044f3cf4360cc77. 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/HKI190423317.
Concerto for Recorder, Oboe and 2 Violins in C Major, RV 87: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94ee1cbf81397f3d36edc53a2045a0fe62ee53c485bb049e135f2e04033024b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI190423318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fba50e67e92ea3886a09632f4b2a647b1ae026697a81baab6a70f50ecdff96. 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/HKI190423319.
Chamber Concerto in G Minor, RV 103: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a737f902bec878101130e7075b8f46a6d5b4a637d942938fcfb012d74282908. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/HKI190423301.
Chamber Concerto in G Minor, RV 103: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a3e2371e9cfa80ed5846880dbe6d6a6d53c4739cf2085f02ac3366d641dceb. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/HKI190423302.
Chamber Concerto in G Minor, RV 105: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf061516f59b67745950d57c580102b37a26b8bb542cc1d35218e37a9519474de. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190423307.
Chamber Concerto in G Minor, RV 105: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a48ae038e18f3a3528076ab1e445a53acfd3a18707ac1de529df19784fed0eb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI190423308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931fe42a01007054f6535a9a54d1b8b80aad45e656b2f03b9b769169a8bae109. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKI190423310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0549f8c92b32ae383596abab3495dcc49f7b4f55748ee496883b43131e4117d7. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/HKI190423311.
Concerto in D Major, RV 94: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4137e9866015e5e3e7db5487ef83b02b7f7c2ecbbe10b7a0e241b43f8ac633c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKI190423312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bc66b175b2a0e189f5076361675cc05a01a7eb629140c9f139ef504809f90c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI190423320.
Concerto in G Major, RV 101: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe407aff41638c3246e49d45ce36b664149be4037d95686b73c301d4542a59400. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKI190423321.
Jeney: Alef: Hommage A Schonberg / Apollonhoz (To Apollo) / 12 Songs