David Alagna (born in Paris, 1975) is a French stage director and composer. As a composer he is best known for his opera Le Dernier jour d'un condamné based on the story by Victor Hugo, to a libretto
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 0x7c3ec56cbcbb05cbf221bfe224cef9423d68433ba5bf661dcf4580cffc48116b. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6c14d49-d016-46ce-9372-195408f350eb.json and https://artists.proofprofile.net/proofs/artist/d6c14d49-d016-46ce-9372-195408f350eb.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 0x25700b707b95934de956279933b95f3a553092f9f7331f7ea689009327332b70. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRUM71601955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82e21104fbf9e7657bee14881f0ccbb8b3512d48c2a4070b48925444e0e1423. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRUM71601957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8e3ed91b90e88060515dc1fd666d834005146d53afd0022410b3d7ec30822d. 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/FRUM71601958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0168f39f4a9aa7f861862def0b73df7c1df519aef6222636a743bd584fe76ef. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRUM71601959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f1a8b3074b9307fb06e2bedf0c49b080011e576ced5abcd8b3cb2ee87224a3. 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/FRUM71601960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb77ce9a93d355c9769e6b8eec885df4a3d77463c4a8607a4810b264407c762. 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/FRUM71601963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6115fd1a9db5571ec345c0883f04ed9fbcaaa73b069ff36f006ce915a85a59fa. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FRUM71601964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b95735177a9f560ec86b3b8762bb7dbd3c32f779c923dbc8d9a76ac7862e3f4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRUM71601965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e489739583df41502d4ae373de3962dab4033da0f28ca294f78de9cecb66c0. 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/FRUM71601966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7874d8ba76a342044d620b673a7a93c4a479dcc452e6cbd9afff65ef43361b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:16:42Z), 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/FRUM71601967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54e36b71e4fb6671053e50cfe9f2303547f096ef4d3a22c418e6960b7d0c373. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FRUM71601969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf30984125271d5eb13850f84016bfb7df62b212eef8cb15c2f6ec23753c861. 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/FRUM71601970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2137f07176821525f7237c741d0b134a47884667433b805b4278ac2b9032bfd. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FRUM71601971.
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 0x6fa888628db3bfc55a8b48df466348d6d9db7bed4585c99c3ff480cb529bc1fe. 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/FRUM71402799.
Pagliacci / Act 1: Recitar... Vesti la giubba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db1330a3ce45ee0b0d0ec59ca2fc426001439ef71df42f0dd5e4167be19140a. 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/FRUM71402809.
Les 100 Plus Beaux Airs de Roberto Alagna
L'elisir d'amore / Act II: Una furtiva lagrima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f792ae5bb5278bfff2ddbf1b55382ea7fe771d9ead6a5768420d613e8339e6. 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/GBAYC0103080.
Les pêcheurs de perles, WD 13 / Act I: À cette voix... Je crois entendre encore
Orchestra of the Royal Opera House, Covent Garden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe239f4615706572c66e8fc1a2e656f54d659cb9ec332577b0bee3f631cf528b3. 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/GBAYC0003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3214dd9b019c48236b22d63bbaeea3e0d5a688185dc6fb9dee46b856938c25e. 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/GBAYC0301566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd193c1af84050f5228aba8b23d283f1b29a28c75b43bd3b626afe84fea9fbe. 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/CH4529680030.
Don Giovanni, K. 527 / Act 2: Deh! vieni alla finestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713d6364009165f145500e4d51799596c44a48babd8730364f50472cd0d9aa90. 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/CH4529680040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f766c31919c529a244e0cd33b716aeb4a7caed6abdc21710c9d09218389f48. 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/CH4529680190.
Faust, CG 4, Act III: "Salut! Demeure chaste et pure" (Faust)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9bdfb542e46ef79102cd8bfcad24cd9c32695912b71c5837cf7f3694634896. 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/FROV62435102.
Martha, Act III: "Ach! so fromm" (Lyonel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f198df8d7d8a80c1b9ee37cb9ff912c02d9b820b08ea330972f3e4dca04163. 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/FROV62435104.
Eugene Onegin, Op. 24, TH. 5, Act II Scene 2: "Kuda, kuda, kuda vi udalilis" (Lenski)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfddbee2e2850948d2d144769ee39f2f5058a58bc07f4ecd336d8855df6dcd7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FROV62435108.
Sadko, Scene 4: "Les diamants chez nous sont innombrables" (L'Indien)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f4c147e2eae22301dd26f58e5069c5fa6c243eec3a40554e92b2c7de680815. 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/FROV62435109.
Polyeucte, CG 11, Act II Tableau 2 Scene 1: "Nymphes attentives" (Sextus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264685f1bb21badb22e6c2cb7b12b28d8998cc126d2994e74fe8b7c7cc170bfa. 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/FROV62435110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe78ad4398d56e40e108faa4e89c06b91577f9b6a8871da376f7d6f38c79d229. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FROV62435118.