Alexander Ferdinand Grychtolik (born 6 September 1980 in Berlin) is a German harpsichordist, improviser, musicologist and academic. Grychtolik is married to the harpsichordist Aleksandra Magdalena Gr
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 0xf69269935a5f96b2f1a94237953866f013627671b331cfce4f67f8fcd9d876a4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b2508ff-c567-4492-bad0-1cc766103a72.json and https://artists.proofprofile.net/proofs/artist/6b2508ff-c567-4492-bad0-1cc766103a72.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bach: Celebration Cantatas - Blast Lärmen ihr Feinde, BWV 205a / Entfliehet ihr Sorgen, BWV 249a (Schäferkantate)
Blast Lärmen, ihr Feinde!, BWV 205a, "Krönungskantate": I. Blast Lärmen, ihr Feinde! (Chorus)
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 0xcf715a4b795846ee3d08d44e988cc6dee9f01a0bac94981d6905e5ea03ae5ad8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEE471900016 — a six-check JSON result.
Entfliehet, verschwindet, entweichet, ihr Sorgen, BWV 249a, "Schäferkantate"/III. Entfliehet, verschwindet, entweichet, ihr Sorgen (Duetto)