Actual details?

This one works exactly as described, when used, you go into conversation with your Spirit weapon and they'll tell you how much dura can be repaired and that it will bless them. If you die, there is a chance the blessing will fall off.

-You can trade this item once. Upon trading, it will bind to its new owner.

Except, according to this, it's not actually true. So that's why we need to get the actual details.

This is referring to the Spirit Liqueur of Blessing, itself. Similar to the Fine/Credne Reforge Tools, you can only trade/sell to another player once.

Yup. You're allowed to sell the potion to another member of the game, but then they can't sell it. Similar to the reforges, as Kiyoura mentioned. The permanent factor means that if you buy the item, it doesn't expire like dyes. The blessing isn't permanent itself, it can fall off.