Riot Blockchain (RIOT) announced the purchase of 1,000 next generation Bitmain S19 Pro Antminers for $2.4M from BitmainTech PTE.The transaction was funded through cash on hand.The new S19s are expected to increase its aggregate operating hash rate by 46% to approximately 358 petahash per second.Riot anticipates receiving the S19s by early July. Source: Press Release