Despite soaring in the past, this top crypto still has substantial upside over the long term.Bitcoin (BTC -1.38%) keeps proving the skeptics wrong. As of July 31, the world's leading digital asset has soared 27% just in 2025. This continues a fantastic long-term streak, with Bitcoin now trading close to its all-time highs. There are certainly investors out there that have missed the boat. And seeing this cryptocurrency's price appreciate so much in the past can discourage them from jumping in the waters. Bu ...