What is the relationship between Coinbase and bitcoin in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

"We're seeing about a 300 per cent increase in bitcoin buys across all Europe in the past few weeks (not much from Greece though, they aren't able to)", the Coinbase tweet said.

Answer: industry