Messaging app provider Telegram says it has raised $850 million in the first part of its controversial initial coin offering, public records show. According to CoinDesk's ICO Tracker, the previous record was the token sale by Tezos, which raised $232 million last year. Launched in 2013 by Russian brothers Pavel and Nikolai Durov, Telegram announced in January that it intended to raise $1.2 billion via a sale of its own token known as "Grams." Having struggled with high operating costs, as previously reported by CoinDesk, a successful ICO would likely secure the struggling firm's future. There are concerns about the governance of the tokens, as detailed in the ICO white paper, and the voting power of the TON Foundation set up to manage the reserve tokens kept by Telegram.