A Canadian insurance company was hacked by the Bitpaymer Ransomware operators who encrypted 1,000 computers and 20 servers. To receive a decryptor, the operators demanded $1.2 million as a ransom payment. The victim’s insurance company convinced the UK courts to freeze a bitcoin wallet containing over $800K worth of a ransomware payment. After making the payment, the insurance carrier tracked down the ransom payment to a wallet hosted at the Bitfinex cryptocurrency exchange. The court documents state that the hearing was held in private to prevent the wallet holders from being tipped off and transferring the bitcoins.
Source: https://www.bleepingcomputer.com/news/security/ransomware-bitcoin-wallet-frozen-by-uk-court-to-recover-ransom/