Is investing in a crypto presale or ICO halal?
Most presales fail on uncertainty before any question about the token arises. You pay today for something that does not yet exist, with no specification you could enforce, no delivery date you could rely on, and no obligation on anyone to build what was described. Islamic contract law requires that the object of an exchange be defined - and a whitepaper describing intentions is not a specification. There is a genuine exception in Islamic law for paying in advance for goods not yet in existence, called salam, but its conditions are strict precisely to control this risk: the goods must be specified by measurable attributes, the delivery date fixed, and the price paid in full at contracting. A token whose eventual function depends on whether a team delivers does not meet the specification requirement. Beyond the contract, the empirical record matters: a large majority of ICOs have failed or turned out to be fraudulent, which is context rather than a ruling but is not irrelevant.