It has now been confirmed that Colonial Pipeline paid 75 BTC ransomware to DarkSide hackers and after payment they started to get operational, but this story continues.
They also attacked other companies like Toshiba Tec Corp manufacturer of barcode scanners, printers, and other electrical equipment, and they have access of 740GB stolen data.
Brenntag also paid 78.29 BTC on May 11 to same DarkSide group and Elliptic tracked DarkSide wallet and it appears their servers for blog website, payment processing and DoS operations had been seized.
Some mainstream media earlier claimed that this payment was made with anonymous cryptocurrency but we now know it was Bitcoin.
I am still trying to find and identify their wallet address that had 57 payments from 21 wallets address.
https://www.elliptic.co/blog/elliptic-follows-bitcoin-ransoms-paid-by-darkside-ransomware-victims