Julien Libeer (born October 1987 in Kortrijk) is a Belgian classical pianist. Libeer has won several awards for his compositions, and regularly performs his works at a variety of international stadium
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 0x672fcbc77c892c4c88ac4772c9d85918fbcf30c02ac3e803873460c29f97072b. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77123ff6-521a-480d-a815-ae41f519be7e.json and https://artists.proofprofile.net/proofs/artist/77123ff6-521a-480d-a815-ae41f519be7e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J. S. Bach & Beyond: A Well-Tempered Conversation
Introduction and Polonaise, Op. 3: I. Introduction. Largo
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 0xf73ab969bfa6728e0fcaaf3371c07149a919dbdd7d4744d20fe2006e5a7b9a22. 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/FRUM72300640.
Introduction and Polonaise, Op. 3: II. Alla polacca. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650ef72fcc92497e3f70c08632dcd7819622e12bcf6a3c1acb2edb59b21f2591. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRUM72300641.
The Chopin Project : Complete Chamber Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650ef72fcc92497e3f70c08632dcd7819622e12bcf6a3c1acb2edb59b21f2591. 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/FRUM72300641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4423c8e19b1a5524858194efd09e2aea5ffbae32e4f5e269b76bc45aeae18830. 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/FR3Z51600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a822e87b4e2cad52a42400df3513d5121ba979af3c31c8608f6586282238536. 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/FR3Z51600073.
Le Carnaval des Animaux, R. 125: VIII. Le Cygne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5e796754780fb3a4439d2a3a6a88977d570ca1f7aeada11dee83672b58ee55. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/FR3Z51600074.
Sonata for Cello and Piano in A Major, FWV 8: I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d3d7de3709d56c3190fcd2966dcdc190140841ce4239dc7a2f0abec451d2b1. 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/FR3Z51600075.
Sonata for Cello and Piano in A Major, FWV 8: III. Recitativo - Fantasia. Ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e850929167562c3196c93e9f5293ad0d68608805de3b4f341327690b5f7d54. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FR3Z51600077.
Sonata for Cello and Piano in A Major, FWV 8: IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ba398313b90748b94e47aafb482bb26e7f6ac4b367b9797215a7eadd1c1ff5. 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/FR3Z51600078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb827f375444e1141c4ad373c93e0aea8da23abff69d6b9b5f0313bbfc2bda6ed. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR3Z51600083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2429a3329069b901c4f3363092d0d9c1a12d806636dd8280f82d338bf61864. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FR3Z51600084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202b67113aa04d3a1e3f495e62f472cc0aa89adab7664364b7550df55125ca44. 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/FR3Z51600086.
Chopin: Introduction and Polonaise, Op. 3: I. Introduction. Largo