Choi Jung-ho (; born February 9, 1990), known professionally by his stage name Choi Nakta (), is a South Korean indie singer and songwriter. He debuted in 2013 with a song, Ice Cream. Biography Choi
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 0x53f7f5d2178b499b1232a1ec8ccd818a93e46de1873ab309703eb62a5cfc6f09. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8e0ab75-67e0-49bb-adee-a56199f43700.json and https://artists.proofprofile.net/proofs/artist/d8e0ab75-67e0-49bb-adee-a56199f43700.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xe2b9906770a93edbb1109a62f32cc506f90d33b4fd72143de70bf7679f9dfcfc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/KRA341631135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcee2ce0db21bb0faef5feec476baec4a458a9afe86cc472dca5cac544c4855. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/KRA341749832.
Couple on the Backtrack (Original Television Soundtrack), Pt. 4
Couple on the Backtrack 고백부부 (Original Television Soundtrack), Pt. 4
시를 잊은 그대에게 (Original Television Soundtrack), Pt. 6
When You're On The Blacklist Of Bullies Pt.2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770da17d4564f53d00f025fabc887632bb3cd0530d54c21272baa3651e2dd983. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZEKE1916152.
어서와 Meow the secret boy (Original Television Soundtrack), Pt.13
Meow the secret boy (Original Television Soundtrack), Pt.13
Meow the secret boy (Original Television Soundtrack) Pt. 13
18 again, Pt. 3 (Original Television Soundtrack)
18 again Pt.3 (Original Television Soundtrack)
MY ROOMMATE IS A GUMIHO, Pt. 4 (Original Television Soundtrack)
MY ROOMMATE IS A GUMIHO (Original Television Soundtrack) Pt.4
Poong, the Joseon Psychiatrist2 (Original Television Soundtrack), Pt.4