Libertarianism it not incompatible with socialism. It is only incompatible with coercive socialism.
One of core values of socialism is that the rich have a moral obligation to redistribute some of their wealth to the poor. However, this redistribution doesn't have to happen by coercive means.
There are also non-coercive ways of achieving this: ostracism, shaming, persuasion, education, prizes, fame, social norms, "whuffie", etc
The crypto economy has the potential to formalize and automate these redistribution mechanisms (see Vitalik Buterin's SocialCoin idea), making them so effective that coercive, tax-based redistribution is no longer necessary.
Moral values of the two systems are incompatible.
In socialism, the moral value is that it is "right", "fair" or "just" to take money from one person and give it to another.
It is the belief that some people have a claim in the work of others.In libertarianism the moral value is that it is "right", "fair" or "just" that a person gets to keep the fruits of their labor.
It is the belief that people have no claim on the work of others.Practical matters, like how the transfer of wealth is done in socialism, are totally secondary. Obviously you could make arguments for the "lesser evil" of non-coercive methods.