Bitcoin's market cap topped $1 trillion for the first time in two years.
The leading cryptocurrency has a market cap greater than US$856.81 billion, the eighth-largest firm in the world.
After yesterday's slump due to hotter-than-expected U.S. January inflation figures, Bitcoin rallied on Valentine's Day.
According to CoinGecko data, the first blockchain-based coin climbed roughly 7% in 24 hours and 20% weekly to trade at US$51,733 at midday ET.
After the U.S. Securities and Exchange Commission approved 11 spot Bitcoin exchange-traded funds, investors could trade the cryptocurrency again.
CoinShares data shows that U.S. Bitcoin ETFs, which allow investors to trade Bitcoin shares on the stock market of the world's largest economy, saw US$4 billion in net inflows yesterday, including the largest daily inflow of US$651 million.
Bitcoin investors are watching the quadrennial halving, which reduces miner incentives to 3.125 Bitcoins per block from 6.25 Bitcoins and slows Bitcoin inflows.
Bitcoin blockchains generate blocks every 10 minutes.