Karin Kei Nagano (born 1998) is an American pianist. Early life and education Nagano was born in Berkeley, California. She began studying piano at age 3, first with Elena Filonova, then with Germaine
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 0x126138bb0fa845e643fe70f63b9ea34a9c892b942343ff430dee587eaf8ddadc. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5034c74-928b-4098-8d0f-8bc5146fa090.json and https://artists.proofprofile.net/proofs/artist/b5034c74-928b-4098-8d0f-8bc5146fa090.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Concerto No. 7 for 3 Pianos in F Major, K. 242 "Lodron": I. Allegro
Mozart & Poulenc: Double & Triple Piano Concertos
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 0x460131eb3a97a35f6955984343722fe684a22e8c5ec58d852e04fc0075c74f06. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLE422420201.
Piano Concerto No. 7 for 3 Pianos in F Major, K. 242 "Lodron": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacab262c1885f323bef9353969dd2b3c85719dca2b758a2fb53007e2242312f0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLE422420202.
Piano Concerto No. 7 for 3 Pianos in F Major, K. 242 "Lodron": III. Rondo. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5e21cc67595d8193189ef8fa70c2a46d197d7be4ca058c2698264a02d16a85. 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/NLE422420203.
Mozart: Piano Concerto No. 7 for 3 Pianos in F Major, K. 242 "Lodron": III. Rondo. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5e21cc67595d8193189ef8fa70c2a46d197d7be4ca058c2698264a02d16a85. 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/NLE422420203.