Louis Langrée (born 11 January 1961) is a French conductor. He is the son of organist and theorist Alain Langrée. Biography Early years Langrée studied at the Strasbourg Conservatory, but had no fo
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 0x75d7ae6c61322107f75abf6c6b6ac3da2aeb46f1e991c13609f186cef5532bc6. 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/d07a1662-0092-4277-b4aa-341552671c63.json and https://artists.proofprofile.net/proofs/artist/d07a1662-0092-4277-b4aa-341552671c63.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart: Cosi fan tutte, K. 588, Act 1: "Temerari, sortite fuori" (Fiordiligi)
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 0x23c5f0e75783b531f1dcf9f3c1dcca1199399de141279883a5d25e340c69ec78. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102269 — a six-check JSON result.
Mozart: Cosi fan tutte, K. 588, Act 1: "Come scoglio immoto resta" (Fiordiligi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d860ff5a24071d3e8d00bbfd2735df07f103b6c3631a2581c531625c34e7927. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102270 — a six-check JSON result.
Mozart: Cosi fan tutte, K. 588, Act 1: "Ah, scostati!" (Dorabella)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2551f2cdff08cdaaa0cad8db4f09879958dbad519775a8089f97c6009ac0d826. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102271 — a six-check JSON result.
Mozart: Cosi fan tutte, K. 588, Act 1: "Smanie implacabili" (Dorabella)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212ba73a9c46088b9dc0f7e3cb4f40ae288242fc7085048937229f387dd72139. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102272 — a six-check JSON result.
Mozart: Cosi fan tutte, K. 588, Act 1: "In uomini, in soldati" (Despina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b65d4784498f544c48a6d28f231ee48bc9e550fe94e192096793f0cdc0e7ad5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102273 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 3: "E Susanna non vien!" (Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88312c26935f73083d1e0721d13895a1460bb67ac3be71d8197c3a12ba423313. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102274 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 3: "Dove sono i bei momenti" (Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105f1cd43f09753bbe118ed467be571315df5b46bd43124b41ee517c7167b6e3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102275 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 4: "Giunse alfin il momento" (Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0dff41f288507ea6d7caeb947a09470535c7023bc7c96ae7a66af575682fd0. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102276 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 4: "Deh, vieni, non tardar" (Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1c0b4e5d5799df60180eb52507a0ab50d13ff827e378a5119b7a3558db27ea. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102277 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 2: "Voi che sapete" (Cherubino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf1e200fe79919077610f46e5f07c4cfcd9fd508ef7fe5a61ed921860d9c557. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102278 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 2: "Crudele? Ah no, mio bene!" (Donna Anna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cc06865495ebd3d71a309aa26d21dbf6058bc8e8baa85630cea353f8a0f825. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102279 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 2: "Non mi dir, bell'idol mio" (Donna Anna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbed1f5cf6d5099f4a40ccc6af3bb792af5f8f9a9a58b225e18904b93115136e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102280 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 2: "In quali eccessi, o Numi" (Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66f55ac0b52409d80cd5d898792c15c7b0bde73325320311aeb81e93ee36a46. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102281 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 2: "Mi tradì quell'alma ingrata" (Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5dfe44a01ce5490a580c737fc78fbc6159a9ad69394c078c2833e368ad9d53. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102282 — a six-check JSON result.
Mozart: Idomeneo, K. 366, Act 1: "Tutte nel cor vi sento" (Elettra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abda41a0e698e6f0da51de6f3ae56d711360a6c6bc979767cb854877d3c2046. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102285 — a six-check JSON result.
Mozart: Lucio Silla, K. 135, Act 3: "Pupille amate" (Cecilio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9ca2e7dd7c83bc933ac7fa630e957059899945fcc0166281b9a45ee52c96d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102286 — a six-check JSON result.
Mozart: La clemenza di Tito, K. 621, Act 2: "Non più di fiori" (Vitellia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa352db0e67c6d5dcbb25f75277c5f3aa50cd3801255b90137cf7ea2b33f81cbd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102288 — a six-check JSON result.
Die Zauberflöte, K. 620, Act II: Der Hölle Rache (Queen of the Night)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4a412faf74de2d71d186fd31353cc1ef4f4a8ccb71a04bb857b561f0f77ab0. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0002644 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 2: Arie. "Der Hölle Rache" (Königin der Nacht)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4a412faf74de2d71d186fd31353cc1ef4f4a8ccb71a04bb857b561f0f77ab0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0002644 — a six-check JSON result.