Sa Chen (; born 21 November 1979) is a Chinese pianist. She won first prize in the 1994 China International Piano Competition, fourth place in the XIV International Chopin Piano Competition in 2000, f
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 0x770ac8379e10034d54d392178076fdf98636af3d9de760df1d7d63df36d79c6f. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/624aec8c-810f-48ea-893e-bb8ac60c0928.json and https://artists.proofprofile.net/proofs/artist/624aec8c-810f-48ea-893e-bb8ac60c0928.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Concerto No. 1 in E Minor, Op. 11: II. Romanza - Larghetto
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 0x7198680b00ef51a6739c9e10375f47f14663ec8324a313d35baabca61c84f4c5. 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/NLE420801202.
Pictures at an Exhibition: Promenade III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b3fff06086477418106f778d3f6927da2b9a804e3eaecab5ec7062471451eb. 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/NLE420900910.
Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato
Rachmaninoff: Piano Concerto No. 2 in C Minor, Op. 18
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34745ace6797f7def8a926c091196168bc3a55029176ead5cc87e738583def27. 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/NLE421100101.
Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a2172ca22cd443a547b05acc56acd3512552acc640a917a8805a5762e8b751. 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/NLE421100102.
Rachmaninov: Piano Concerto No. 2 - Grieg: Piano Concerto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a2172ca22cd443a547b05acc56acd3512552acc640a917a8805a5762e8b751. 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/NLE421100102.