As virtually every bitcoin ETF has been essentially rejected and amid a bloodbath in cryptocurrencies, a new way to invest in the underlying technology has emerged. Today, a pair of blockchain ETFs debut - the Amplify Transformational Data Sharing ETF (BLOK) and the Reality Shares Nasdaq NextGen Economy ETF (BLCN).It's interesting that just this week, the SEC asked the two funds to drop the word "blockchain" from their names. It seems that it wants to try to control a flood of money pouring into these products following the activity of stocks, such as Riot Blockchain and Kodak, who saw their prices skyrocket following the mere mention of blockchain. The fact that the Marijuana ETF is actually known as the ETFMG Alternative Harvest ETF hasn't stopped that fund from approaching the $400 million level in assets.Blockchain has the potential for an enormous number of practical tech applications. Look no further than the Enterprise Ethereum Alliance, which counts dozens of tech companies among its members interested in developing and utilizing the technology. Is an ETF, such as this, at a compelling entry point in the current market environment? Would you be a buyer of a blockchain ETF?Feel free to vote and/or comment down below with your thoughts!