diff --git a/contracts/WitnetRequestBoard.sol b/contracts/WitnetRequestBoard.sol
index 372a3c02..93da562c 100644
--- a/contracts/WitnetRequestBoard.sol
+++ b/contracts/WitnetRequestBoard.sol
@@ -17,6 +17,7 @@ abstract contract WitnetRequestBoard
     function class() virtual external view returns (string memory) {
         return type(WitnetRequestBoard).name;
     }
+    function channel() virtual external view returns (bytes4);
     function factory() virtual external view returns (WitnetRequestFactory);
     function registry() virtual external view returns (WitnetBytecodes);
     function specs() virtual external view returns (bytes4);
diff --git a/contracts/core/defaults/WitnetRequestBoardTrustableBase.sol b/contracts/core/defaults/WitnetRequestBoardTrustableBase.sol
index d224f2a5..073e357a 100644
--- a/contracts/core/defaults/WitnetRequestBoardTrustableBase.sol
+++ b/contracts/core/defaults/WitnetRequestBoardTrustableBase.sol
@@ -100,7 +100,7 @@ abstract contract WitnetRequestBoardTrustableBase
         )));
     }
 
-    function ddrTag() virtual public view returns (bytes4) {
+    function channel() virtual override public view returns (bytes4) {
         return bytes4(keccak256(abi.encode(address(this), block.chainid)));
     }
 
@@ -774,7 +774,7 @@ abstract contract WitnetRequestBoardTrustableBase
         returns (uint256)
     {
         return uint(keccak256(abi.encode(
-            ddrTag(),
+            channel(),
             block.number,
             msg.sender,
             _queryRAD,