after years of delays and setbacks the first bitcoinlinked exchangetraded fund in the us the proshares bitcoin strategy etf made its debut tuesday marking a watershed moment for the crypto industry the fund  trading under the ticker bito  rose about 3 to 4125 as of 933 am in new york it has been longawaited by both the crypto community and investors on wall street many of whom have argued for years that a bitcoincentric exchangetraded fund has been overdue the proshares fund is based on futures contracts and was filed under mutual fund rules that sec chairman gary gensler has said provide “significant investor protections”