South Korea built its Polymarket gambling case out of public blockchain records

The structure Polymarket cited in its own defense is the structure that produced the evidence. It runs noncustodial and peer-to-peer with automated settlement, and there is no conventional list of users by real name ^[5]. Investigators read the public chain instead ^[4].

Polymarket told the commission there were no Korean-language services and no support for won payments, and that smart contracts meant it never directly managed user funds. The commission replied that technical characteristics did not exempt a service from South Korean law ^[8]. It pointed to the platform's role in operating the markets, setting trading rules, handling crypto deposits, withdrawals and settlement, and collecting transaction fees ^[7]. The winner-takes-all payout was cited as encouraging speculative gambling ^[7]. On the mechanics, the two sides are not far apart: a Tiger Research report describes the basic contract as paying $1 if the event occurs and $0 otherwise, with an oracle deciding after expiration ^[19].

Polymarket's geographic restrictions were updated on August 14 to exclude 39 countries, among them Japan, Singapore, Taiwan, Thailand and North Korea, with South Korea absent from both the fully blocked and the close-only list ^[14]. The access block came four days later ^[5].

The sums are small. Spread across 26 accounts, the roughly $12.7 million works out to about $488,000 each, and the single largest user at 5.7 billion won is 32 percent of the case on his own ^[2][1][3]. Against the $69 billion of retail crypto volume TRM Labs attributed to South Korea in its first-quarter 2026 index, the entire investigation is 0.018 percent of the flow ^[3]. What is being decided is the definition. Article 246 of the Criminal Act punishes gambling and Article 247 punishes running a gambling place, and the KMCSC invoked both, plus the National Sports Promotion Act, when it restricted access ^[13][12].

The two reports date the police step differently. Cryptopolitan says 26 users were charged on September 15 ^[20]. Cointelegraph describes them as under investigation as of Tuesday, citing Asia Economy on data the National Police Agency gave to lawmaker Yoon Kun-young ^[2].

Cryptopolitan's reading is that enforcement will not reduce demand. It will push platforms toward stricter geofencing instead, and move users and liquidity to jurisdictions that regulate them, with the CFTC's supervision of designated contract markets such as Kalshi as the contrast ^[18][17]. The migration goes unmeasured in both reports. The sector figures show how little capital would have to move: DeFiLlama puts $390 million locked against $4.4 billion of trading in seven days, about eleven times the locked value in a week, while Polymarket alone did $4 billion in a month ^[16][4].

I would expect the geofence, not the litigation, to settle this, and the way to know I am wrong is a Korean court taking the derivatives characterisation seriously. Tae-Lim Kim, managing attorney at AXIS Law, told Asia Economy that the transactions could meet the legal requirements for gambling. Calling them prediction derivatives, he said, would be difficult to use as a direct defense in criminal proceedings. The ability to trade contracts and exit positions before settlement could still be relevant to a court's assessment ^[11]. The users are making that argument anyway: they say Polymarket should be treated as a crypto-based derivatives investment market ^[9].