The author, a crypto investor and co-founder of The Block, is highlighting his experience in blockchain development by stating he has built four blockchains. This suggests a strong background in the underlying technology of cryptocurrencies, which could be relevant for investors following his insights on projects like Cardano (ADA) given the quoted tweet's author, Charles Hoskinson (founder of Cardano and IOHK). Investors might consider following his future commentary for insights into promising blockchain projects or trends.