Unlike traditional open-source projects, developers of open-source blockchain-based projects can reap large financial rewards thanks to a modern form of seigniorage. I consider a developer working on an open-source blockchain-based software that can be used only in conjunction with a specific crypto-token. This token is first sold to investors via an Initial Coin Offering (ICO) and then traded on a frictionless financial market. In all equilibria of the game, in each post-ICO period there is a positive probability that the developer sells all of his tokens on the market and, as a consequence, no development occurs.