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 0x6ed14d31b11a41b92a7a309b608c7fc4686c09ecc5152c6a576f4f4bc030423c. 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/7d709621-8689-4eae-a213-d04c90c8fd33.json and https://artists.proofprofile.net/proofs/artist/7d709621-8689-4eae-a213-d04c90c8fd33.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Swan Piano Variation (From The Carnival of the Animals, R.125, Arr. for Piano by Svetoslav Karparov)
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 0x750ee5d9bf2d9ea3e95cc2004458291bad72a44553cdc9575e14dae1d903edbc. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE862201065 — a six-check JSON result.
The Moldau Piano Variation (From Ma Vlast, JB 1:112, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989023c030bfb0f295d84e7728548ea918db8b473881ecd11469e18ffba8fde3. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/DEE862201068 — a six-check JSON result.
Air Piano Variation (From Orchestral Suite No. 3, BWV 1068, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7714ce52b3007195fc96a48a5d2755e15c970da5820288a5085a90611384bf01. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/DEE862400066 — a six-check JSON result.
Ode to Joy Piano Variation (From Symphony No. 9, Op. 125, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fed5f4955843c2f5322daebd824e3c445d109714a2aee140323a9ff2e46bd3. 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/DEE862201078 — a six-check JSON result.
Pas De Deux Variation (From The Nutcracker, Op. 71, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e357bf35708fd77e6feb6145f00e0e801a9bd8576b1b7ad6183eebd409e96. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/DEE862201046 — a six-check JSON result.
Wiegenlied Variation (From Fünf Lieder, Op. 49, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52307808c3cf8f96198736d6ebe7dc8fa9ee3487271b5deaeb637bc150153cfd. 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/DEE862300116 — a six-check JSON result.
Moonlight Sonata Variation (From Piano Sonata No. 14, Op. 27, Arr. by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3e809874327bfbe1a458098c7dc12b79d6a776d375c9bfc4d9edfc0563a911. 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/DEE862300345 — a six-check JSON result.
The Nutcracker March Variation (From The Nutcracker, Op. 71/TH 14, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5902d57be188a542ca0f4292766dc82a3244e69d2a9e5bc3f6cb2c210811c550. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEE862300361 — a six-check JSON result.
Ave Maria Variation (From Méditation sur le Premier Prélude de Piano de Bach, CG 89, Arr. for Piano and Violin by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca042ad83f39e0a12c2c7fe769a98c5b3734f744111cfeb7632b8a664023f6f7. 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/DEE862300359 — a six-check JSON result.
Canon in D Variation (From Canon in D Major, P. 37/T. 337, Arr. for Piano and Violin by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245dd7ad71268554e548c6fadb817f69942bb40b0bb9f3b473a36eb41a67ed44. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEE862300365 — a six-check JSON result.
Lascia ch'io pianga Variation (From Rinaldo, HWV 7b, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005eeb53bf8112d5d349a2b6d6ce225a6addcf3a38a50d338e81fdff4da55ecf. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEE862300343 — a six-check JSON result.
Mozart Lacrimosa Variation (From Requiem, K. 626, Arr. for Piano and Cello by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf047921ded6bab95503849d245492cb785ed85eb19e174e0e2301f02d3785c. 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/DEE862300353 — a six-check JSON result.
Morning Mood Variation (From Peer Gynt Suite No. 1, Op. 46, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff898e440669ef1bb81899d64ebeadeaaab18368e4227dac18b25e1a8d7fbde. 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/DEE862201062 — a six-check JSON result.
Wedding March Variation (From A Midsummer Night's Dream, Op. 61, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e14f9977bd64e75ad137a58131c524f3ae4709cef132a22e1587cf3219dba5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEE862300340 — a six-check JSON result.
Adagio Variation (From Adagio in G Minor, Arr. for Violin and Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67380a3da4f48428df75baa0fb5df8b7e6b479ce188e96724d36e51ab2396edb. 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/DEE862201001 — a six-check JSON result.
Mozart Symphony 40 Variation (From Symphony No. 40, K. 550, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c95458d16e905bae4d2120814c96b85657993043c77f78a57b0be0c29eec880. 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/DEE862300332 — a six-check JSON result.
Eine Kleine Nachtmusik Variation (From Serenade No. 13, K. 525, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724dc410774e03ff1889462f3f862ac74f5345629b9f106bbd3550a2e338515a. 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/DEE862300118 — a six-check JSON result.
Dance of the Flutes Variation (From The Nutcracker, Op. 71, Arr. for Piano by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19a63baf60737e5c96d2b8dd7c24f835edfd64c7b26639aca793eea893f1c5c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEE862201075 — a six-check JSON result.
Air Variation (From Orchestral Suite No. 3, BWV 1068, Arr. for Piano and Cello by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2ee327382ac88d802ffa1a78f0cc2b9dcd49683ff6068306442c94bf0afacd. 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/DEE862201072 — a six-check JSON result.
Für Elise Variation (From Bagatelle in A Minor, WoO 59, Arr. by Svetoslav Karparov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc58a0dca5a4ab35273e22132ef5fb5a27e7b59837622627113da86d5368f7d5. 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/DEE862300349 — a six-check JSON result.