They spent a ton of cash building their own miners and mined something like 1,500 blocks: https://www.blocktrail.com/BTC/pool/21inc https://www.blocktrail.com/

They spent a ton of cash building their own miners and mined something like 1,500 blocks: https://www.blocktrail.com/BTC/pool/21inc https://www.blocktrail.com/BTC/pool/21inc The chips on devices thing was a pivot once their initial idea didn't work.