diff --git a/packages/evm/contracts/Enclave.sol b/packages/evm/contracts/Enclave.sol
index c620d77f..72977b82 100644
--- a/packages/evm/contracts/Enclave.sol
+++ b/packages/evm/contracts/Enclave.sol
@@ -160,6 +160,7 @@ contract Enclave is IEnclave, OwnableUpgradeable {
         e3 = E3({
             seed: seed,
             threshold: threshold,
+            requestBlock: block.number,
             startWindow: startWindow,
             duration: duration,
             expiration: 0,
diff --git a/packages/evm/contracts/interfaces/IE3.sol b/packages/evm/contracts/interfaces/IE3.sol
index bafb28b5..60971504 100644
--- a/packages/evm/contracts/interfaces/IE3.sol
+++ b/packages/evm/contracts/interfaces/IE3.sol
@@ -8,6 +8,7 @@ import { IDecryptionVerifier } from "./IDecryptionVerifier.sol";
 /// @title E3 struct
 /// @notice This struct represents an E3 computation.
 /// @param threshold M/N threshold for the committee.
+/// @param requestBlock Block number when the E3 was requested.
 /// @param startWindow Start window for the computation: index zero is minimum, index 1 is the maxium.
 /// @param duration Duration of the E3.
 /// @param expiration Timestamp when committee duties expire.
@@ -21,6 +22,7 @@ import { IDecryptionVerifier } from "./IDecryptionVerifier.sol";
 struct E3 {
     uint256 seed;
     uint32[2] threshold;
+    uint256 requestBlock;
     uint256[2] startWindow;
     uint256 duration;
     uint256 expiration;
diff --git a/packages/evm/contracts/registry/NaiveRegistryFilter.sol b/packages/evm/contracts/registry/NaiveRegistryFilter.sol
index 61faa32c..cf7d719b 100644
--- a/packages/evm/contracts/registry/NaiveRegistryFilter.sol
+++ b/packages/evm/contracts/registry/NaiveRegistryFilter.sol
@@ -34,6 +34,7 @@ contract NaiveRegistryFilter is IRegistryFilter, OwnableUpgradeable {
     error CommitteeAlreadyPublished();
     error CommitteeDoesNotExist();
     error CommitteeNotPublished();
+    error CiphernodeNotEnabled(address ciphernode);
     error OnlyRegistry();
 
     ////////////////////////////////////////////////////////////
@@ -47,6 +48,15 @@ contract NaiveRegistryFilter is IRegistryFilter, OwnableUpgradeable {
         _;
     }
 
+    modifier onlyOwnerOrCiphernode() {
+        require(
+            msg.sender == owner() ||
+                ICiphernodeRegistry(registry).isCiphernodeEligible(msg.sender),
+            CiphernodeNotEnabled(msg.sender)
+        );
+        _;
+    }
+
     ////////////////////////////////////////////////////////////
     //                                                        //
     //                   Initialization                       //
diff --git a/packages/evm/test/Enclave.spec.ts b/packages/evm/test/Enclave.spec.ts
index 6a32bb43..c7b7fa2e 100644
--- a/packages/evm/test/Enclave.spec.ts
+++ b/packages/evm/test/Enclave.spec.ts
@@ -587,10 +587,12 @@ describe("Enclave", function () {
         { value: 10 },
       );
       const e3 = await enclave.getE3(0);
+      const block = await ethers.provider.getBlock("latest").catch((e) => e);
 
       expect(e3.threshold).to.deep.equal(request.threshold);
       expect(e3.expiration).to.equal(0n);
       expect(e3.e3Program).to.equal(request.e3Program);
+      expect(e3.requestBlock).to.equal(block.number);
       expect(e3.inputValidator).to.equal(
         await mocks.inputValidator.getAddress(),
       );