In the case then will it be transactions using P2P? And what guarantees will be offered to both buyer and seller?
the p2p transactions ? what guarantees they need ? and if you are talking about the decentralized marketplace then there will be smartcontracts not p2p
p2p = peer to peer transactions, involves only two parties ( one person sends ENET tokens to another )
smartcontracts = 3 parties are being involved into the marketplace transaction