Algorithm 2: GetData

Require: DC’s ID, Proof of Access

payable

if Validation(DC’s ID, Proof of Access) then

PaytoOwner(data value, DO’s address)

$SK,H\left(F\right)$ = GetfromOwner(set of attributes S)

$Fid,EF,CT$ = GetfromOffChain()

$s{k}_F=Decrypt(CT,SK)$

$F=SymDec(EF,s{k}_F)$

else

REJECT Getting

end if