The insurance was underwritten by Arch Syndicate 2012, which provides specialized insurance for corporations.
Source: https://www.coindesk.com/bittrex-secures-record-300m-insurance-on-crypto-held-in-cold-storage
Source: https://www.coindesk.com/bittrex-secures-record-300m-insurance-on-crypto-held-in-cold-storage
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