ARK Invest has added exposure to staked Solana (SOL) to its thematic exchange-traded funds (ETFs).Canada's regulatory approval for staking-based Solana ETFs has sparked institutional confidence.Solana's growing institutional interest and the potential U.S. approval could further boost SOL's rally.Solana's total value locked (TVL) is around $7.05 billion, indicating significant growth compared to Ethereum.