“Five years ago, before Uniswap v1 launched, I deployed a token called HayCoin to use for testing,” he posted on X. “This was when gas was so cheap that the mainnet could be used as a testnet. After the first version launched, I created a A small test liquidity with a small fraction of the total supply and left the rest in my wallet. I also used it to test the migration contract from Uniswap v1 to v2.