Fig 1.
Communication architecture of WAPS.
Fig 2.
Blockchain data structure consisting of three blocks.
Fig 3.
The system architecture for auditing communications of WAPS.
Fig 4.
An example of multi-chain structure for WAPS.
Table 1.
The data structure of block header.
Table 2.
The data structure of block body.
Fig 5.
New block structure.
Fig 6.
Block data deletion process based on double hash chains.
Fig 7.
The effect of number of peers on audit query latency.
Fig 8.
The effect of size of block on audit query latency.
Fig 9.
Time overhead introduced by the deletable blockchain of different blockchain lengths compared with the standard blockchain.