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 0x29c0c4eabc9f533e4a19fc82150f9481c3edcdfc786bfbdc18d9699368b3c83f. 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/dbe60ecb-7657-4ef3-9075-843eb872dce2.json and https://artists.proofprofile.net/proofs/artist/dbe60ecb-7657-4ef3-9075-843eb872dce2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eugene Onegin, Op. 24, TH.5 / Act 1: Introduction
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 0x9a4e42101d2172ae09e26fbcf76dc7c11ec5bb5a1b47f9aa7b53598073d167ff. 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/NLA509004901.
Eugene Onegin, Op. 24, TH.5 / Act 1: "Slikhali l vi za roschei glas nochnoi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cafee359029d07d809c8e247acb0105eae26f11a94cbf74b68eb45ec8b220c. 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/NLA509004902.
Eugene Onegin, Op. 24, TH.5 / Act 1: Peasants' Chorus and Dance. "Bolyat moyi skori nozhenki so pokhodushki" - "Uzh kak po mostu, mostochku"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84e53134623fa0350c1ec7dc973aee0698d10bec591b9f11242219e68a1c88a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLA509004903.
Eugene Onegin, Op. 24, TH.5 / Act 1: "Kak ya lyublyu pod zvuki pesen etikh...Uzh kak po mostu, mostochku"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd558eac4b19d9bd4f56ced37a02d765cf17dbcb78e5e5d9a4a004f1985d671. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:56:37Z), 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/NLA509004904.
Eugene Onegin, Op. 24, TH 5 / Act II: "Kuda, kuda, kuda vi udalilis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4de6c654efc5086241ab8a5406ef2bcc5de889d4fb6bd88396b5f6c96372d2. 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/NLA509004922.
Eugene Onegin, Op. 24, TH.5 / Act 1: Scene and Arioso. "Kak shchastliv, kak shchastliv ya!" - "Ya lyublyu vas"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d92bbf1028efa7623abf543371973bb45d2d6861015c95c32b82405bd3b5fb0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLA509004908.
Eugene Onegin, Op. 24, TH.5 / Act 1: Letter scene. "Puskai pogilabnu ya, no pryezhde"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11366f01751e0b876572f4dd3e5b49569ddad066eac395addf08949a7697412e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLA509004911.
Eugene Onegin, Op. 24, TH.5 / Act 1: "Kogda bi zhizn domashnim krugom"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27209a06c3b1c91bb8a89fefaf9dd85d60a0c4a447aba2a5853d2f0c11925e28. 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/NLA509004915.
Suder: Festival Mass in D Major "Dona nobis pacem" & Symphonische Musik No. 2
Dona Nobis Pacem - Festival Mass - Kyrie
A. Kastalsky, Eternal memory to the heroes
A. Grechaninov, Ecumenical mass, Op. 142
Vladimir Rebikov, All-night Vigil, Op. 44
Alexander Chesnokov, The Liturgy of St. John Chrysostom, Op. 8
Pavel Chesnokov, Sacred compositions, Op. 9
P. Chesnokov, Sacred compositions, Op. 18, Op. 19
P. Chesnokov, Memorial service №2, Op. 39
P. Chesnokov, Ten Communion Hymns, Op. 25
P. Chesnokov, Sacred compositions, Op. 21a, Op. 22
P. Chesnokov, Open to Me the Doors of Repentance, Op. 21a, No. 2 (Покаяния отверзи ми двери)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fde74043faac1bec0d871d7a58e4d8561f478711d5af4cc5bf5c21317301cfb. 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/RUA3R2106213.
P. Tchaikovsky, The All-Night Vigil, Op. 52
Pavel Chesnokov, Sacred Compositions (Vol.3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b04b74f67ffba37aff69ce0e4955319135cde1e30c3751284d25d8182dd2f62. 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/RUA3R2073881.
Pavel Chesnokov, Sacred Compositions (Vol.1)
Pavel Chesnokov, Hymns of the All-Night Vigil, Op. 21
Nikolay Tcherepnin, Secular compositions
Nikolay Golovanov, Secular Compositions, Op. 7, Op. 8
Nikolai Tcherepnin, The Liturgy of St. John Chrysostom, Op.32
Nikolay Golovanov, Sacred compositions (Vol. 2)
Nikolay Golovanov, Sacred Compositions (Vol.3)
Nikolay Golovanov, Sacred Compositions (Vol. 1)
Arthur Gottschalk: Requiem for the Living
Weinberg: Symphony No. 18 - Trumpet Concerto
Rachmaninoff: All-Night Vigil, Op. 37 "Vespers"
Rachmaninov: Vespers & Liturgy of St. John Chrysostom
Tchaikovsky: 1812 Overture; Serenade for Strings; Romeo & Juliet Overture etc.
Overture 1812, Op. 49 - Choral version, edited by Andrew Cornall: Ouverture solennelle "1812", Op. 49 - Choral Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3940babfd1b984c26e64986f7860f2d6aa1d199547d5c26d7b7d8415e6962028. 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/GBF079611460.
Alliluia. Se zhenikh gryadet (Alleluia. Behold the bridegroom) - c. XVIII century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f326105d46c3f6a5bb4711e61ca35180f56e0e3fdeba84ef117399d921d5cb7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA509506401.
Vecheri tvoeya tainïya (Of Thy mystical supper), Op. 58
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3744bacecde35fa4529413b9199d93ac30d79d7a48a75c9131278b2923c5d4a. 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/NLA509506403.
Razboinika (The Wise Thief), Op. 40, No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ca433e28727ff08bb2c65146d4a328e3837a91a81610739f996aaaa5640fe5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLA509506404.
Da molchit vsyakaya plot' (Let all mortal flesh keep silent), Op. 27 No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcf33bee866f13c6a1bcc560a2c7b98ddf747d1cc21bf4168e521cfef6a3ffd. 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/NLA509506405.
Plotiyu usnuv (In the flesh Thou didst fall asleep)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ec25d934757821691df4cb35b61f48bd99cd3edcaa851603c60a04d07b5832. 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/NLA509506406.
Amin'. Khristos voskrese iz mertvïkh (The Paschal Hours)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a5ad588ee11e0210372a9699f4196f4ecab796b0a57eb0ce8b97f75cbb5a7d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLA509506407.
Angel vopiyashe (Paschal Hymn to the Virgin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeaa5263514361d5174af315fec111b4d26ea0ed682685d6fbf6cf2346871ef4. 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/NLA509506408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b167774c0dcdd76f5d46f324b435a0233f00c100595e5aea48b9c1a21d4a878. 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/NLA509506311.
Rachmaninov: Vespers (All-Night Vigil), Op.37