I can't say for sure what a judge would make of a cryptographically secure hash of a piece of content that there's no record of prior to the hash's registration

I can't say for sure what a judge would make of a cryptographically secure hash of a piece of content that there's no record of prior to the hash's registration on a blockchain. I think if somebody tries to claim authorship of eg. a screenplay I've written, such a hash should be pretty good evidence in my favour.