thumb|Sitkovetsky Trio in 2023, Alexander on the left Alexander Sitkovetsky (born 1983) is a British violinist. Biography Family Sitkovetsky was born in Moscow to a musical family; his father being
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 0xa7a2a9853ce92e58a7fd57b7653fd5cef5a7947b3b552c895d6174c48310048f. 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/dec432d9-3a27-491e-968c-c6f12755f9c4.json and https://artists.proofprofile.net/proofs/artist/dec432d9-3a27-491e-968c-c6f12755f9c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brandenburg Concerto No. 5 in D Major, BWV 1050: I. Allegro
Württembergisches Kammerorchester Heilbronn
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 0xc4a77e8e7bbb69e75469b8e2a1adc1d2a0cda32040dd1b4155ec2cd61efd8980. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422007601.
Brandenburg Concerto No. 5 in D Major, BWV 1050: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa13f24a10ba9dd87f1cbd531e03ee89d3105857de625eec47b79084506dc5f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLE422007603.
Brandenburg Concerto No. 2 in F Major, BWV 1047: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373083ace47fece498f789252e36979c8fe98b84f4f0744ee564faada691de7d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422007607.
Brandenburg Concerto No. 2 in F Major, BWV 1047: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cf38164737ed2b1b46c55ff8b62b2fb674e606e7ae3996114256a9ad9727e7. 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/NLE422007609.
Concerto for 2 Violins in D Minor, BWV 1043: Largo ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed19e974956f2a5f1180154e9c9b44509d3f0d6d449ee455b52acf232e87ad4a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBBBA0800642.