Table 1.

Functions of data trading contracts built into the PDP back-end network.

Data trading smart contract function	Function description
$\mathrm{tx}\_\mathrm{commision}(\alpha )$	Called by the service provider, the revenue sharing between the user and the service provider when setting trading data
$\mathrm{tx}\_\mathrm{request}(t{x}_{\mathit{data}})$	Called by the data purchaser to initiate a data trading request
$\mathrm{tx}\_\mathrm{request}(res{p}_{tx\_request},i{d}_{tx\_request})$	Called by the user to respond to the trading request of the data purchaser
$\mathrm{tx}\_\mathrm{confirm}({\mathit{id}}_{tx\_response})$	Confirm the trading when the data buyer receives the user data