Securitize (SECZ), the BlackRock-backed tokenization specialist that went public last week, is off to a rough start despite arriving as one of the few pure-play bets on one of Wall Street's hottest crypto trends. The firm's shares tumbled as much as 25% on Tuesday before clawing back some of the sell-off, and Securitize is down roughly 40% since completing its merger with special purpose acquisition company Cantor Equity Partner II last week.