The two telcos will collaborate to create a "borderless" blockchain ID.
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Consumers will be able to use KT's blockchain platform to authenticate whether the food they bought is halal, the telco claims.
Samsung Electronics, SK Telecom, KT, LG Uplus, KEB Hana Bank, Woori Bank, and Koscom have formed a consortium to build a new blockchain network as a foundation for a new mobile authentication service.
South Korea's Ministry of Science and ICT will develop a blockchain voting system that will go on trial in the private sector in December.