Cointerra.

Cointerra is the name mempool.space gives to blocks mined by CoinTerra, Inc., a company founded in Austin, Texas, in mid-2013. It designed chips and machines for mining bitcoin, and its chief executive, Ravi Iyengar, had been a lead architect at Samsung’s research centre in Austin. Besides selling its TerraMiner machines, it ran machines in rented data centres, in Utah and elsewhere, and looked after machines for customers. From May 2014 it also sold mining contracts: customers paid for a share of its machines’ work and were paid every week according to the share they had bought.

mempool.space credits it with 870 blocks, found between 10 May and 1 December 2014. In its busiest week, in late August 2014, it found about 4.6% of all blocks. The blocks carry no name. Blockchain.info’s list of pools, which mempool.space’s list grew out of, linked their reward address to Cointerra in July 2014. Each block’s first transaction paid the whole reward to that one address, and CoinTerra paid its customers separately. That reward is separate from the transactions confirmed inside the block.

Its last block came on 1 December 2014. C7 Data Centers, which hosted its machines in Utah, sued it, saying that by early December CoinTerra owed about $1.4 million in unpaid bills. CoinTerra said C7 had shut off its machines, leaving it in default on loans secured on them, so it switched off its mining elsewhere too; it stopped paying its contract customers after 19 December. Its chief executive blamed a bitcoin price that kept falling while the network’s mining power kept rising. On 24 January 2015 CoinTerra filed for Chapter 7 bankruptcy, in which a company’s assets are sold to pay what it owes.