diff --git a/contracts/Marketplace.sol b/contracts/Marketplace.sol
index 99a55a9..1eba224 100644
--- a/contracts/Marketplace.sol
+++ b/contracts/Marketplace.sol
@@ -95,8 +95,6 @@ contract Marketplace is Collateral {
     return requestState[requestId].selectedOffer;
   }
 
-  uint256 private constant POR_SECTORS = 10; // amount of sectors in PoR scheme
-
   struct Request {
     address client;
     Ask ask;
@@ -125,9 +123,9 @@ contract Marketplace is Collateral {
   }
 
   struct PoR {
-    bytes1[POR_SECTORS * 48] u; // parameters u_1..u_s
-    bytes1[96] publicKey; // public key
-    bytes1[512] name; // random name
+    bytes u; // parameters u_1..u_s
+    bytes publicKey; // public key
+    bytes name; // random name
   }
 
   struct RequestState {
diff --git a/test/ids.js b/test/ids.js
index adcedce..053488f 100644
--- a/test/ids.js
+++ b/test/ids.js
@@ -4,7 +4,7 @@ const { keccak256, defaultAbiCoder } = ethers.utils
 function requestId(request) {
   const Ask = "tuple(uint256, uint256, uint256, uint256)"
   const Erasure = "tuple(uint64, uint64, uint64)"
-  const PoR = "tuple(bytes1[480], bytes1[96], bytes1[512])"
+  const PoR = "tuple(bytes, bytes, bytes)"
   const Content = "tuple(string, " + Erasure + ", " + PoR + ")"
   const Request =
     "tuple(address, " + Ask + ", " + Content + ", uint256, bytes32)"