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 0x98ef3ff8e3e35713a69a80d2616163613d239092e5efcfaa68e8cb10efb75f89. 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/2368a5c2-1b5e-4d53-93c7-9aba2e7cbf95.json and https://artists.proofprofile.net/proofs/artist/2368a5c2-1b5e-4d53-93c7-9aba2e7cbf95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rimsky-Korsakov: Pan Voyevoda / Sadko / May Night
The Snow Maiden, Op. 12: I. 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 0xb1827b5a1fed746dc2f8ca980426a79be81edca481b29cc4ece3006d88c140f1. 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/HKI199619101.
The Snow Maiden, Op. 12: II. Dance And Chorus Of Birds
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375ce5021ee41e2ce53520f32829f14e434d43303f2ee0d840521341ed14916e. 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/HKI199619102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763f174a41ca72082dc6a0323de10562e41dec7424d1b67fe3edfc9aa7266c31. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199619103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa278f0b57a6fa8f680078044abfc9d1464b51dafa537a68cf91bd59e4bd1b37. 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/HKI199619105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6d633f2d6147d346908aadbb62976c4e58f8bd09adb09bed4f7e2df8b370d2. 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/HKI199619106.
The Snow Maiden, Op. 12: VI. Lel's First Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81800ad53b33680ca764c7e282e11bbfe01ea178bbd6240eecca14dfc318146f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199619107.
The Snow Maiden, Op. 12: VIII. Entr'acte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a3e67e4e1b845c4874a85f8afb1e01113f5e3ebe3d0f7a189437853d9e4882. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI199619109.
The Snow Maiden, Op. 12: IX. Chorus Of Blind Gusli-players
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b602b5d37502480d3ded6ef23e678f4ccfc92bfa0f3abf02be83f4eac70de3. 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/HKI199619110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df1228550bf48f74a6fdef3986ea33358c68e3baeacbfcfe433120c89ea85ae. 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/HKI199619111.
The Snow Maiden, Op. 12: XIII. Dance Of The Tumblers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c438f8d74dbbcea843ac2ca055823553521fd68fada1049003b0e1ade11b31b. 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/HKI199619114.
The Snow Maiden, Op. 12: XII. Girls' Round Dance (Khovorod)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a637343702f07dedc72fe38a1e218a1624464934929402842ac468e16e09d6f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199619113.