Robert Lortat (12 September 1885 – 5 May 1938) was a French pianist, well known in his native Paris and in other musical centres including London. He was closely associated with the works of Frédéric
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 0x8d8d533ae479afbcb791079beffcd907ec7cc8ac3280a47869d109cd8f141ec5. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7fa1678-0cab-4dc1-8674-2741f37e8e4f.json and https://artists.proofprofile.net/proofs/artist/c7fa1678-0cab-4dc1-8674-2741f37e8e4f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xb4fb3592d863a77f0e87c3c11fe8b89cdd2067eab4c8ea8b40592ddc45f3c5e1. Chain 2 (Bitcoin): anchored in block 957810 (2026-07-13T05:55:46Z), 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/DE1QW2508929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fc271ebb167f2f0035a6b88e091ea3e7eb13693e9b9001b64215d90858a628. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/DE1QW2508930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac61395f95cf37435353c0772dc50837dc7f647e7f886c5073381a7ab7a78c2. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/DE1QW2508931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c44df4bf485f64ef0b468399a2c90e375958c7e0b9237885b81b59ea3c30b0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DE1QW2508932.
2 Arabesques, Op. 45: No.1 (In Form of an Etude) - Duo-Art 6388
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55dd76230c052ff9960fc00e7734ff8d0eaf348cf7f55d70c3d1b8ed2e6f6df. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:08:09Z), 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/DEPI82320976.
4 Pieces, Op. 36: No. 4, Etude "The Spring" - Duo-Art 5699
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17321a581d58cbcaa863692f1cfd9b0f88cdd0e078b1bb971ba10dc6e397e9b6. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:08:21Z), 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/DEPI82322144.
On an Overgrown Path, Book I: VII. Good Night!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8821afd7dedd894645a62fe15a4b6f7aa84d70a6cae52e9f297cbf404ba7a4f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEPI82308223.
Humoresques De Concert, Op. 14: No. 6, Cracovienne Fantastique - Duo-Art S-30738
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6427b67aca1b559e84a07601db1d58239496bbe91c3566afdb6ff471e926f64. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEPI82409016.
Lieder Ohne Worte. Op. 102: No. 4, Sighing Wind - Duo-Art 057 Br
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1831b352553dd6c9d02e3bcb4c96f245cc0e5d8740505396f8938fc51178e2. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:11:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1QW2502121.
Sonata No. 1, Op. 24. IV. Perpetual Motion (Rondo) - Duo-Art 6489
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1543768963a7dc5b0fabf4e3af502bb5486762c494021dc1eae1c1dfd1d2b9f9. 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/DE1QW2502115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b84cb1de2a6d36ef3fa2407cf9a2cd59f8f95a3ea0f881eb3fb563e5db4c36. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DEPI82449844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ba7371c2e90626e08cc0a0e1dc0b2ec6833c85f122a9236dcd56b87c9c6da3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEPI82512913.
Kaleidoscope. Op. 40, No.4 - Duo-Art 6845
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510ffa0513b898d9157adeb782cf7f102cac6c823d94f554fbed21bc8c7a3d39. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEPI82454122.
Tableaux for Solo Piano, Book I: Vers Le Vent D'ouest, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbe51e646822c3fa0355ef68408642f0bad8e330aa02f2b2050eb0672f3cccf. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/DEPI82307785.
Twelve Etudes. Op. 39. No.8. Shadow Dance - Duo-Art 5791
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340b834d12aff1907b1ba8573cd754381fbcdcd857193f9cc79eb18c0bd7c767. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEPI82502567.
Kleine Suite, Op. 18: No. 3, Scherzo Humoristique - Duo-Art 5788
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d67ca957077dbe6b90cec4947322f0e3415ad8b321ab39b18fae16b58ed3fe. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEPI82321768.
Etudes, Op. 10: No. 5 in G♭ Major, 'Black Keys' - Duo-Art 8022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b67e5c6e8f0a34a91a637c0f63d2bfb45a693b84aa1eaa2dae150830d618cc. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEPI82319537.
24 Morceaux Caractéristiques, Op. 36: No. 13, Etude in F-Sharp Major - Duo-Art 6187
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1685a22e9075e8f47c5a9db2d97b4b5c412eb7411b30f84958a6b40db38e0b59. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEPI82422615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb862d4f01ba839e222d8990a3fe0cb45a00cafa23f952a2a5c6afc74d20320bb. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEPI82433499.
Nutcracker Suite, Op. 17a (Arr. Solo Piano by Giorni): Dance of the Reed Flutes (Danse Des Mirlitons) - Duo-Art 6132
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24e28db9463e852d73ffb9b205a553fb9c485377efcc6e0bfa3d7e105730f59. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEPI82422534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f390e05c45adc1a4876ca3fde1468246ef355e708c60ffbddb0c2829700bec. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:05:47Z), 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/DEPI82416647.
Souvenirs De Voyage, Op. 71: No. 6, Malagueña - Duo-Art 67827
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c35db36ecee25541c8a12f417f6a88a558733fd3eed686549d3f77cfa94e8d. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:38:35Z), 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/DEPI82325040.
Etudes, Op. 11: No. 1, Berceuse - Duo-Art 5965
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35b53eb77c45d3bb9c342a0eea8f4517a4419bbea1e9b9c49819096ac708ed3. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/DEPI82321593.
Arabesque No. 2 in G Major - Duo-Art 5808
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954eb0fcd66c6f17f3114d328ef259024ac32293232f8d01637f1a4de8dc65c5. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:25:50Z), 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/DEPI82322140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210b8cd9021640a7d6fd9675f252e881ba563c5b343fe09aedfb3c6df9050ff4. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/DEPI82321600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e38dff7b4b7c461adc567a5656c11f6cdf979691c4a70c7130f9ab22dbac99. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEPI82323953.
Ich Liebe Dichn, Op. 41, No. 3 (I Love Thee) - Welte-Mignon 213
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e0a412bcade54c4682c16f3f24c4a81792720858e647475f0b202a205c05e2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEPI82439041.
En Boheme, Op. 82: Bluette - Duo-Art 6178
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a6bf905555073933ad224c382462bc0aeaaa1ac4286ff36c1c399e8e1ba482. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/DEPI82409692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08af98ae13cf8e3ef68b675812e11460548b7ac90f68ddfa741292d1f5a35dbf. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/DEPI82441454.
Piano Sonata No. 8, Op. 13, 'Pathetique': III. Rondo - Welte-Mignon 562
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3466e0efadaa05659dbcd6da799d28b2e5b3a95744c01c73be3aae0a927ad55b. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T13:20:00Z), 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/DEPI82319531.
Chromatic Fantasia and Fugue in D Minor BWV. 903: Fugue - Duo-Art 7317
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d92c9c75cbde4030744f7b13270e5a473176a3022ebaf097f9d86b284fcba7. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/DEPI82321496.
Piano Sonata No. 4, K.282 in E-Flat Major: I. Adagio - Welte-Mignon 1780
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b91c1a11d6065b7481904b7e43bc2c1dfea12f2cc0ed8cd3604842fc419fabe. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/DEPI82400136.
Harmonies Poétiques Et Religieuses, S. 173: No. 10, Cantique D' Amour - Duo-Art 7378
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc214a1540cdc2bb98117ccd41d48cec2041a4247db0b7b57d4c02d163d4d01db. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/DEPI82319982.
Prélude, Choral Et Fugue, Fwv 21: Chorale - Duo-Art 5901
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bffcf5f6dd704b643e5cf438d51eaa9cd7a0fa974f0be49a275bd9e9a513d7b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEPI82312845.
Aus Dem Volksleben, Op. 19: No. 3 from the Carnival - Duo-Art 6040
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46df8d159eead64ff7596a4b7246a015afaa7f61fb635a3c5e7654d11f48e214. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEPI82405382.