Around 28,000 Bitcoin options contracts with a notional value of $2.25 billion will expire today.The impact on spot markets is expected to be minimal as derivatives trading has been muted.Open interest is highest at the $70,000 strike price, with $1 billion in open contracts betting on further Bitcoin decline.Crypto market capitalization declined to $2.65 trillion, with Bitcoin rebounding from below $79,000 to reach $80,000.