>>that prevents you from changing a contract after accepting it but it doesn't prevent someone else from saying that they will no longer sign contracts at old r

>>that prevents you from changing a contract after accepting it but it doesn't prevent someone else from saying that they will no longer sign contracts at old rates. When I refer to a contract, I'm referring to the smart contract that operates a platform, like a market. A market is a persistent platform, so the rules encoded into a smart-contract based market when it's created will apply indefinitely. >>The same would apply to anything involving cryptocurrencies with their wildly-fluctuating exchange rates which don't match the real money either side will need to use. Yes, but the fee charged by the platform can be a fixed percentage of the transaction volume it facilitates, so it doesn't have to deal with exchange rates.