The top contenders for the next big thing in cryptocurrency in 2025 include Ethereum (ETH), Solana (SOL), and Lightchain AI.Ethereum (ETH) remains a leader in smart contracts with its strong base and the new Ethereum Virtual Machine (EVM).Solana (SOL) stands out for its quick and roomy design, making it a good pick for dApps, DeFi, and NFT sites.Lightchain AI is revolutionizing the blockchain world with its AI integration and innovative approach to consensus.