Clearly there's much more to it. For example, cryptocurrencies with those two properties you mentioned are a dime a dozen. I could make one right now by git cloning bitcoin, changing some properties, then running it. And in practice there are thousands with high volume exchange-value. Digital currencies, when combined with ubiquitous exchanges, have such substitutability that I'm not sure there's much of a "network effect" or "lock in", when it's so easy to swap and pay with any of them. "value decided by the market" might be flimsy in this case.
Clearly there's much more to it. For example, cryptocurrencies with those two properties you mentioned are a dime a dozen. I could make one right now by git cloning bitcoin, changing some properties, then running it. And in practice there are thousands with high volume exchange-value. Digital currencies, when combined with ubiquitous exchanges, have such substitutability that I'm not sure there's much of a "network effect" or "lock in", when it's so easy to swap and pay with any of them. "value decided by the market" might be flimsy in this case.