Pavel Alekseyevich Serebryakov (; 28 February 1909 – 17 August 1977) was a Soviet classical pianist and pedagogue. Serebryakov began touring the USSR after ranking 2nd at the I National Competition (
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 0xd65c75a8da7b4d99d9c23e42524149b381196babc8234ed27dabdc1389fef05e. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7431112-1fd8-4b82-a670-ff90dd012c2e.json and https://artists.proofprofile.net/proofs/artist/a7431112-1fd8-4b82-a670-ff90dd012c2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
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 0x07f7fe1627733fbb5843a42e1c0017f52b616b54a713e538a22e81ed120fea2b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA370561322.
Piano Sonata No. 2 in B-Flat Minor, Op. 35: I. Grave – Doppio movimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e05da6ac565659e3738aa478e351cae959a93d111291c48847afaaf4fdef856. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/USA370561325.