Circle, a stablecoin issuer, filed for an IPO with renewed interest from BlackRock and ARK Invest.BlackRock is considering acquiring around 10% of the shares on offer, signaling a strategic interest in digital assets.ARK Invest, led by Cathie Wood, has expressed interest in purchasing up to $150 million worth of shares in Circle's IPO.BlackRock's potential involvement in Circle's IPO would deepen its ties with the company and mark a significant move into the crypto sector.