Hmm. Explain how you intend to verify the truth of a contract, that it existed, if there is no explicit evidence of it (no people, no audio or video recordings)? Or how will you prove that they are not forged (for example, an email)?

Oral contract

Nothing about a past event can be said to have actually happened with a hundred percent guarantee, even when it comes to natural phenomena, let alone human activity.

So-called laws of nature are general principles derived from observations based on incomplete induction. Any documents could have been drawn up and signed retroactively, or falsified in some other way. Witness testimonies are systematically mendacious. Banknotes are forged. Even the almighty blockchain cannot fully guarantee that you won’t be cheated with a money transfer to your wallet.

So signatures on a contract, a herd of witnesses, security camera footage, an oath on the constitution, and so on—these are merely additional arguments presented so that the judge believes that yes, some event in the past did take place. After which the judge makes a decision: I, so-and-so, stake my reputation and assert that such-and-such an event occurred, and from this I draw such-and-such conclusions.

And if you have neither a signed contract nor witnesses to the agreement, but it is known that until now you have given no reason to doubt your words, and in this case you behaved as if a contract had been concluded, then there is a considerable probability that the judge will believe your assertion about the fact that an oral contract was concluded, and will rule in your favor.

Yes, I admit that within one state legislative system or another, a judge may be expressly forbidden from considering transactions true if they are not certified in the manner established by the state. But when you ask how we intend to proceed in the absence of reliable evidence, it can be assumed that the question is actually being asked about ancap.