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 0xa1aea2814eff918a9eacf61536cde02fc24eda73dc67ff4b0ea9f15947a71a26. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0359ec15-819b-4674-9dba-5cc6e34673de.json and https://artists.proofprofile.net/proofs/artist/0359ec15-819b-4674-9dba-5cc6e34673de.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Ropartz: Violin Sonata No. 2 - Sonatine for Flute and Piano - Cello Sonata No. 2
Classical Collection: The Essential 20th Century
Dupont, G.: Maison Dans Les Dunes (La) / Poeme
Furtwangler, W.: Violin Sonatas Nos. 1 and 2 / Piano Quintet in C Major
Brahms, J.: Piano Sonatas Nos. 1 and 2 / Scherzo, Op. 4
Brahms, J.: Piano Sonata No. 3 / 4 Ballades
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 0x1b56a0134166af765300c4849fc4762f429d90cd27615e70924b83d59aeff7b6. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810020 — a six-check JSON result.
Un grand sommeil noir - Version for voice & piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b07368cfe448a2476b9b07b338f79fc082ad5682311f33e48b861617985fc92. 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/GBF079810040 — a six-check JSON result.
Amériques - Original version. Ed. Professor Chou Wen-Chung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aac0b7f0e3ea0575fa89c95eb72d4756b98178360ee483d89441efc4f0d6efa. 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/GBF079613210 — a six-check JSON result.
Offrandes: 1. Chanson de Là-haut (poem by Vincente Huidobro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fda5f0b928d8bf429bca6d82637ef8f600554e92349204bdb3dc9fe2fddbb45. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079613180 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0673991bdb669273fbcc73fd043a845efcb7e2b99da71667acc2cf90205d6f7d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810060 — a six-check JSON result.
Offrandes: 2. La croix du sud (poem by José Juan Tablada)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be34952c256c7733a3c42578dd4223d53bde27ac0b50e5befaef7c00f4ecfc6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079613190 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a15e4a7fd7b7d9c1ef6e2ed4f1df01ed5185f8229bb9c96168230a75b544074. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBF079211760 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5837ced89d88ae39c6dd53f5d8b57412f35e466e25f997018df77fd129d95aca. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBF079711590 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64440ed03fbcc7e6f697ce06b08064e4d9c0d692c94a509b75ef6fc1f2d1876c. 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/GBF079613170 — a six-check JSON result.
Octandre - Rev. & Ed. Chou Wen-Chung 1980: 1. Assez lent
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee1665e48f4f173ff1467af80709876826908596c0dd6763d9d40e42091154d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079711581 — a six-check JSON result.
Un grand sommeil noir - Orchestral version arr. Antony Beaumont
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fa55c5e73716ea7439f03748f2a93a5e419890bb3236c64836065bd6d02a1d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBF079810030 — a six-check JSON result.
Octandre - Rev. & Ed. Chou Wen-Chung 1980: 2. Très vif et nerveux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca43fc911b739d3d005e154e169f95bd15c7c942c574a27d1ea1f1b4e6650e8. 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/GBF079711582 — a six-check JSON result.
Octandre - Rev. & Ed. Chou Wen-Chung 1980: 3. Grave/Animé et jubilatoire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dc015c23193e0f13ad41cb70dddaff2f325aa8f0935ad400e73342521b8c70. 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/GBF079711583 — a six-check JSON result.
Intégrales - Revised & Ed. Chou Wen-Chung 1980
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ee4bdae30c007350f1ed24386aaf4306f07920e37e86367fb58010c0cdca5d. 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/GBF079613200 — a six-check JSON result.
Ecuatorial - Corrections from original m/s by Chou Wen-Chung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fd7814614a19a8d0565afd6ea1e5defa0e097dc72d2a70bb7e3da54ac048dd. 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/GBF079711620 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede9a92278ebbaab6ab4db4682a6cc58f8edf0bb250f42788751d847f3064d2e. 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/GBF079711600 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0211f85f19171dba6c0faa69e04b5133c61779df26d0e26e35bde42040e1df. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079711630 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daa0b61183565cb6c7f20b2036e739c6015a6164736e8c3050b685dfea64daa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079711611 — a six-check JSON result.
Déserts: 1st Interpolation Of Organised Sound
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cf2e6002cff66552858210a61016afed3bc7e0a9ff459c9bdfc3fe414d978f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBF079711612 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda63d46494bd36ca4ebd3a8fa7f861efef4cab832205ef3ece9318f1dbf2888. 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/GBF079711613 — a six-check JSON result.
Déserts: 2nd Interpolation Of Organised Sound
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2fbcc0835a471203bb693f427d5466de11d2bf6a33a5769c59e87b9c542572. 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/GBF079711614 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8e9f7b17988f0751da9769bfb6185da7247ae10381e59c4b753c86297e294f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079711615 — a six-check JSON result.
Déserts: 3rd Interpolation Of Organised Sound
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c9b1f3529b4699be7ce2e88ca309f5fd3f3ff1633d75521b1233730a29432b. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/GBF079711616 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893467df26f86feb8a08f40606f98001a6480315315f46b4a6caa09a4d7ecedb. 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/GBF079711617 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8650ce256d2f4b430e28eeefeac94673a6882f8ecc211a9f698b0d383894eeb0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBF079810050 — a six-check JSON result.
Martinu, B.: Musique De Chambre No. 1 / Les Rondes / Nonet / Fantasia
Indy, V. D': Suite Dans Le Style Ancien / Chansons Et Danses / Piano Quintet, Op. 81 / Suite, Op. 91 (Luxembourg Philharmonic Orchestra Soloists)
Vierne, L.: Spleens Et Detresses / Ropartz, J.-G.: Le Pays / Bloch, E.: Prelude and 2 Psalms
Vierne, L.: Spleens Et Detresses / 4 Poemes Grecs / 5 Poemes De Baudelaire
Vierne, L.: Vocal Music, Vol. 2 - Poemes De L'Amour / Stances D'Amour Et De Reve / Les Roses Blanches De La Lune