The routing performance issues in untrusted environments are the serious challenges for the privacy protection routing protocols in mobile ad-hoc networks (MANET).In order to encourage the selfish nodes and improve the routing performance in untrusted environments

this paper proposes an anonymous incentive mechanism based on hash-chain for the location-aided routing protocols.By using the efficiency and irreversibleness of hash-chain to the location-aided routing protocols

this mechanism can realize immediate incentive to the anonymous forwarders.Moreover

this mechanism can optimize the routing discover process through a route selection mechanism based on the payment price.The anonymity analyses indicate this mechanism can guarantee the anonymities of the nodes involved in routing.The performance evaluation shows that this mechanism has little effect on the routing performance when large amounts of data are transferred

and it is more efficient in small scale networks.