Trading Block for player trading

Has 2 inventories that are locked for the player that placed it (similar to personal safes).
On inventory contains the items you sell, the other the items you got from trading.
2 extra slots to define the trades, 2 extra slots for the customer to input payment/get items.
Maybe similar to https://wiki.industrial-craft.net/index.php?title=Trade-O-Mat, except using adjacent chests because those can be stolen from.
There are better trading block systems like from GoodOlCurrency(https://www.curseforge.com/minecraft/mc-mods/good-ol-currency) but they are 1.12.2.