Unsuk Chin ( ; born July 14, 1961) is a South Korean composer of contemporary classical music, who is based in Berlin, Germany. Chin was a self-taught pianist from a young age and studied composition
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 0xb7da66c086ab89cf3d5558708ff4b0ffa7637baed1294f458ca25fd0fac01403. 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/a965e696-235e-45c6-975c-00247a4988d0.json and https://artists.proofprofile.net/proofs/artist/a965e696-235e-45c6-975c-00247a4988d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chin: Double Concerto; Akrostichon; XI; Fantaisie mécanique
Unsuk Chin: Fantaisie mécanique, Xi, Akrostichon-Wortspiel & Double Concerto
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 0x70f75252f1c0f818659373bce5e20410bb91f2770e0e3455a104a2c42c782190. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CALC40800942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb324a961bc0ceb8bd8a0e30fc3299f68e2d531c55281c229fa18629ed2c370. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CALC40800943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82cd6d9244bc4c1f78bdbd3e07d3f5ea800ec1a5f81f4890785ffc7c1ef48693. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CALC40800945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f24795ecd995b5e794c8f056eaa1a24789d99a24b3e9ed80c6ef999c8ee2541. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRUM71400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db4bcbff0de54d2e2dc7b074b3a03c08c18dd9abcb91670c6839a08b222d04c. 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/KRUM71400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cd186af4229c66ee560f28ad2f21666d62fb483e8a1d629ba0d11a3cbb3a33. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/KRUM71400032.
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 0x6a2b03891dd71cfbeb1388a48914dea793f66aa56e7b13bfa6e95a614a7dd1b1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/KRUM71400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8475f07337b604809fe1689faf70f126d7578cd2b6bfc90b34aabb6006032a79. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/KRUM71400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606e8fb4639a5f5a4b6324d9ee1a4a40043327a38d112586e6fd3e1d545d8cbe. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/KRUM71400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee9e9c680c387b37151e9a6b1ac1abdd688150d9873304cf6ac6d05ccd89a3e. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/KRUM71400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c9c579d7da0250d6d9d46f08c4b89d443cf92e3a1d374fca7431f2581914d8. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/KRUM71400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfca1689200c2c9b51e4ca736b6ca486809e0ce9f6688e2a84620bb8910df45. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/KRUM71400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366062373c36a285e0b81e96557a837a1448f628db4db5609248870bd68c1a74. 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/DESR72341109.
Unsuk Chin: Frontispiece for Orchestra (World Premiere. Live, Hamburg, 2019)
Frontispiece for Orchestra - World Premiere. Live, Hamburg, 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c058b29c8ec01cb96f6b7ef45aa54bbb739086468ce614b089850c9b100c3c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DE1BW2401711.