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 0xa91eaa6fdd4b4658bb561f1dc96ea68e327b4a238dbc1ad49a90ca6292a53007. 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/a3625c9a-dad6-4e7f-a9da-dc244fb7c840.json and https://artists.proofprofile.net/proofs/artist/a3625c9a-dad6-4e7f-a9da-dc244fb7c840.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto in D Major, Op. 35, TH 59: I. Allegro moderato
National Philharmonic Orchestra of Russia
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 0xf1bd503b7f38b927018e599fdecd739088f2120c19040f1c3fc1c80cfc3d8b9a. 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/DEN961901511.
Violin Concerto in D Major, Op. 35, TH 59: II. Canzonetta. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0055085acd4a74adce82c4f7e124a2543429c58878b14aa647ce785b72e1eaa. 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/DEN961901512.
Violin Concerto in D Major, Op. 35, TH 59: III. Finale. Allegro vivacissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a03a5af5ce882f3c622c034679ccf743394a0c603148ea1aee67e67f89a48f. 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/DEN961901513.
Eugene Onegin, Op. 24, TH 5 / Act II: Lensky's Aria (Arr. Auer / Orch. Rot)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b43d127f5c5b7a8cd337902701204b4be220b5c4d9ebcd9b0f9c5f8cf5ab1ef. 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/DEN961901520.
Six Romances, Op. 6, TH 93: VI. None but the Lonely Heart (Arr. Elman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2766ce633a5365a7d0078b4109b420a397dbab2352713167ac397b4776a7a7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961901530.
Souvenir d'un lieu cher, Op. 42: III. Mélodie (Ed. Herrmann)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d786b260b546a41713e3cb7038a913473cccd313ac4e5d36543a9abdac6e6c. 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/DEN961901540.
Six Pieces, Op. 51, TH 143: VI. Valse sentimentale. Tempo di Valse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00821b7cd0475360a74eea2ee589a88e140ba188dc21e38a04a9ccbe49613e2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961901550.
Souvenir d'un lieu cher, Op. 42: Ia. Méditation. Introduction (Orch. Glazunov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08c7a197bef11a79bc8aa50af87016f442e398c31c131d4725db6e35b53a4e2. 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/DEN961901561.
Souvenir d'un lieu cher, Op. 42: Ib. Méditation (Orch. Glazunov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04a46c6a34bb1fd7507133f1aa5922235b3f8b4ec4f227ce5c831abae9c0b96. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEN961901562.
Valse-Scherzo, Op. 34, TH 58 (Arr. Bezekirsky)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5177769a0778fb8fe569b5302642147e3b78a984b22992819a1a930c60330b2b. 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/DEN961901570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f9fa622e26f242e75563052162b3885a8aa66024bd42367c5f93b00d2d8b82. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEN962201470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38b9f2eecdda0c33fbf695e0e21d67a1685a55b8339092d6670e9cbf824a12c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEN962201480.
Suite bergamasque, L. 75: III. Clair de lune (Arr. Roelens for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f144d7be7a6d36f74062c129ee54861ec7912bc1c914768591b3ad39fae192d. 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/DEN962201490.
La vida breve: Danse espagnole (Arr. Kreisler for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62374b852cdd6222c42350a117fc11ba8ad29276ffe26224b6796c390b53fd71. 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/DEN962201500.
Hungarian Dance in D Minor. Allegro non assai, WoO 1/2 (Arr. Klengel for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860ef03ed5ac9379319ad34c0d4bb69e2dbb32b242b3f8be98883e72258b979a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEN962201520.
Hungarian Dance in D-Flat Major. Vivace, WoO 1/6 (Arr. Klengel for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76912461f6103633e71e1a6e6f270a7c548f4d51c84c65c000d4eaa01614f675. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEN962201530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c1f5235f7fe37a7897d622925e752ebd4c7b4953c4a685d546d2d265217bea. 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/DEN962201540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00821b7cd0475360a74eea2ee589a88e140ba188dc21e38a04a9ccbe49613e2. 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/DEN961901550.
Melodie from "Orfeo ed Euridice", Wq. 30 (Arr. Kreisler for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7436503b051f65344cc392e55cc2086bcd9717b185ecd5e2d0d179e8a6373828. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DEN962201510.
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