Utilize the input text as a context reference, choose the right relationship between Coinbase and bitcoin from the options. Options: 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