Two typical scenarios - unions are holding things up until they get a bribe, or there is contraband on board and the holdup enables people to get it off.
So that sounds like at least two parties who would be opposed to an unrevokable ledger. Govt officials awaiting their bribes to let a container pass would be a third party opposed.
Friction as usual.
If you haven't seen it, season 2 of The Wire is mostly concerned with this. Although the show is fictional so I can't vouch for its accuracy on this, but it goes into a good deal of detail.