thumb|Guillaume Lekeu Jean Joseph Nicolas Guillaume Lekeu (; 20 January 1870 – 21 January 1894) was a Belgian composer. Life Lekeu was born in Heusy, a village near Verviers, Belgium. He originally s
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 0x55047a8b17ba76bf5dd38b167524f87485cb9cc6f73889a26ce1776aefb94e21. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b79c6e4e-dc2b-4a46-b1b0-d25b3ef63c6e.json and https://artists.proofprofile.net/proofs/artist/b79c6e4e-dc2b-4a46-b1b0-d25b3ef63c6e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Magnard & Lekeu: Sonates pour violon et piano - Ravel: Tzigane
Piano Sonata in G Minor, V.105: III. Fugue 2
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 0xa20f5332ef5bc86876b1fc6b0e2ad9c8fc69a0f9f10bb87c43c35cacfd814d12. 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/NLY332301382.
Andantino semplice e molto espressivo, V.93
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79ef9f51f125eb165791c48db4fd7cefb53286b749e4a8cf5581cf8061c71ec. 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/NLY332301394.
Morceaux égoïstes, livre 2: II. Andante, V.88
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2459190cb3312046503ccc4956efc1f993f57d69f088122705b8a8ae81374d4c. 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/NLY332301389.
3 Pieces, V.107: I. Chansonette sans paroles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a95f7097eddaf2d90b5c9699e96afa020b592fc17560e3e8bd55960565f15b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLY332301376.
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 0x7f079a0d2da77d7bae976f021b54cb52f511112a53f0293447fc507c77435bfb. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLY332301377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31724b01f556b0bdfdbf45af647d5a40eccf0f3e02612157fd8b07e5484553d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLY332301379.
Piano Sonata in G Minor, V.105: I. Prélude (Très modéré)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe080a34e43483fc77db9765e730078cb0548a082e6c5514caa613ef51939ba3e. 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/NLY332301380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6bb7e35ba9b0bee9dc9819bd33ffb741cbad00559316131c72d6684c0c2be94. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLY332301397.
Chausson: Poème - Lekeu: Fantaisie symphonique sur deux airs populaires angevins & Adagio pour quatuor d'orchestre - Rabaud: La procession nocturne
Lekeu: Music for Violin, Cello and Piano
String Quartet in G Major: I. Allegretto quasi allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207c9d79522344342e2cd959d698b78b295a75af55f2b5bb75a0bedb5e3e21f6. 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/FRY461001000.
String Quartet in G Major: III. Capriccio poco allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54254a832e97cbadbf11bc973e82f828a156bbf99f39ceebd7406a51c476559. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRY461001020.
String Quartet in G Major: V. Poco allegro e molto scherzoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe939087732c972e807c7321f82e275ec3c366f7cfdf71e5141f65e60e5361add. 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/FRY461001040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700eae21212355530d1c123599b435d39c3f7bca0f695094ca939a18780154ac. 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/FRY461001070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d305a9fdae06a76baac46e3a31680c2a4ac6b8a0fbfb4545f8708914af9cdc5. 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/FRY461000990.
String Quartet in G Major: II. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdca10b8d00b755107ab2e48077e50e24fa86ba754535c2a9e769c369a325a3. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRY461001010.
String Quartet in G Major: IV. Romance: Andantino molto moderato quasi andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bbf10ce1d717bdf3e1b25f0f1bb9be5d110a02c0cb4476344061395fe92a34. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FRY461001030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535072eeb38f08dc33a32416ecdb0d34b7b2061625f556e3542a4b8c919373cb. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRY461001060.
Ravel: Complete Music for Violin & Piano
Lekeu: La musique de chambre V (Premières compositions, 1885-1888)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6931e530311f73a7b59eb1f7b3e956b447d08ded4e68ca02d810eb6bf1db617a. 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/BER189008401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeaeedd2309336a31a52ebe6d95f95bdead61e5ef6a94ff00dbaf4c70603c55. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/BER189008406.