TBH, I was thinking about contracts, something like:
- it will be possible to sell services (a good example: house building)
- asking a skilled carpenter to build / improve my home would be like signing a contract (I pay, you work for me)
- this is equivalent to give a temporary permission (based on contract deadline) to some user to modify my building, that's why I told you that your suggestion meets mine.
Did not thoguht about crime/punishment to handle this, that would be applicable too.
Would still opt for temporary permissions but your alternative is a valid one ;)