diff --git a/l1-contracts/src/core/Rollup.sol b/l1-contracts/src/core/Rollup.sol
index d6f8b2c8577..ac9a5cd3eaa 100644
--- a/l1-contracts/src/core/Rollup.sol
+++ b/l1-contracts/src/core/Rollup.sol
@@ -468,7 +468,8 @@ contract Rollup is EIP712("Aztec Rollup", "1"), Leonidas, IRollup, ITestRollup {
     // Decode and validate header
     HeaderLib.Header memory header = HeaderLib.decode(_header);
 
-    bytes32 digest = keccak256(abi.encode(_archive, _txHashes));
+    uint8 domainSeperator = uint8(SignatureLib.SignatureDomainSeperator.blockAttestation);
+    bytes32 digest = keccak256(abi.encode(domainSeperator, _archive, _txHashes));
     setupEpoch();
     _validateHeader({
       _header: header,
diff --git a/l1-contracts/src/core/libraries/crypto/SignatureLib.sol b/l1-contracts/src/core/libraries/crypto/SignatureLib.sol
index bcae500df8c..29e37357bc8 100644
--- a/l1-contracts/src/core/libraries/crypto/SignatureLib.sol
+++ b/l1-contracts/src/core/libraries/crypto/SignatureLib.sol
@@ -12,6 +12,14 @@ library SignatureLib {
     bytes32 s;
   }
 
+  /**
+   * @notice The domain seperator for the signatures
+   */
+  enum SignatureDomainSeperator {
+    blockProposal,
+    blockAttestation
+  }
+
   /**
    * @notice Verified a signature, throws if the signature is invalid or empty
    *
diff --git a/l1-contracts/test/sparta/Sparta.t.sol b/l1-contracts/test/sparta/Sparta.t.sol
index e892c5e54a5..caaac46645f 100644
--- a/l1-contracts/test/sparta/Sparta.t.sol
+++ b/l1-contracts/test/sparta/Sparta.t.sol
@@ -189,7 +189,8 @@ contract SpartaTest is DecoderBase {
 
       SignatureLib.Signature[] memory signatures = new SignatureLib.Signature[](_signatureCount);
 
-      bytes32 digest = keccak256(abi.encode(archive, txHashes));
+      uint8 domainSeperator = uint8(SignatureLib.SignatureDomainSeperator.blockAttestation);
+      bytes32 digest = keccak256(abi.encode(domainSeperator, archive, txHashes));
       for (uint256 i = 0; i < _signatureCount; i++) {
         signatures[i] = createSignature(validators[i], digest);
       }
diff --git a/yarn-project/circuit-types/src/p2p/block_attestation.ts b/yarn-project/circuit-types/src/p2p/block_attestation.ts
index a847452f8b9..04ccfdf4d52 100644
--- a/yarn-project/circuit-types/src/p2p/block_attestation.ts
+++ b/yarn-project/circuit-types/src/p2p/block_attestation.ts
@@ -7,7 +7,7 @@ import { BufferReader, serializeToBuffer } from '@aztec/foundation/serialize';
 
 import { ConsensusPayload } from './consensus_payload.js';
 import { Gossipable } from './gossipable.js';
-import { getHashedSignaturePayloadEthSignedMessage } from './signature_utils.js';
+import { SignatureDomainSeperator, getHashedSignaturePayloadEthSignedMessage } from './signature_utils.js';
 import { TopicType, createTopicString } from './topic_type.js';
 
 export class BlockAttestationHash extends Buffer32 {
@@ -53,7 +53,7 @@ export class BlockAttestation extends Gossipable {
   getSender() {
     if (!this.sender) {
       // Recover the sender from the attestation
-      const hashed = getHashedSignaturePayloadEthSignedMessage(this.payload);
+      const hashed = getHashedSignaturePayloadEthSignedMessage(this.payload, SignatureDomainSeperator.blockAttestation);
       // Cache the sender for later use
       this.sender = recoverAddress(hashed, this.signature);
     }
@@ -62,7 +62,7 @@ export class BlockAttestation extends Gossipable {
   }
 
   getPayload(): Buffer {
-    return this.payload.getPayloadToSign();
+    return this.payload.getPayloadToSign(SignatureDomainSeperator.blockAttestation);
   }
 
   toBuffer(): Buffer {
diff --git a/yarn-project/circuit-types/src/p2p/block_proposal.ts b/yarn-project/circuit-types/src/p2p/block_proposal.ts
index 2733f03db19..8e64f4c1fd9 100644
--- a/yarn-project/circuit-types/src/p2p/block_proposal.ts
+++ b/yarn-project/circuit-types/src/p2p/block_proposal.ts
@@ -7,7 +7,11 @@ import { BufferReader, serializeToBuffer } from '@aztec/foundation/serialize';
 
 import { ConsensusPayload } from './consensus_payload.js';
 import { Gossipable } from './gossipable.js';
-import { getHashedSignaturePayload, getHashedSignaturePayloadEthSignedMessage } from './signature_utils.js';
+import {
+  SignatureDomainSeperator,
+  getHashedSignaturePayload,
+  getHashedSignaturePayloadEthSignedMessage,
+} from './signature_utils.js';
 import { TopicType, createTopicString } from './topic_type.js';
 
 export class BlockProposalHash extends Buffer32 {
@@ -49,7 +53,7 @@ export class BlockProposal extends Gossipable {
     payload: ConsensusPayload,
     payloadSigner: (payload: Buffer32) => Promise<Signature>,
   ) {
-    const hashed = getHashedSignaturePayload(payload);
+    const hashed = getHashedSignaturePayload(payload, SignatureDomainSeperator.blockProposal);
     const sig = await payloadSigner(hashed);
 
     return new BlockProposal(payload, sig);
@@ -60,7 +64,7 @@ export class BlockProposal extends Gossipable {
    */
   getSender() {
     if (!this.sender) {
-      const hashed = getHashedSignaturePayloadEthSignedMessage(this.payload);
+      const hashed = getHashedSignaturePayloadEthSignedMessage(this.payload, SignatureDomainSeperator.blockProposal);
       // Cache the sender for later use
       this.sender = recoverAddress(hashed, this.signature);
     }
@@ -69,7 +73,7 @@ export class BlockProposal extends Gossipable {
   }
 
   getPayload() {
-    return this.payload.getPayloadToSign();
+    return this.payload.getPayloadToSign(SignatureDomainSeperator.blockProposal);
   }
 
   toBuffer(): Buffer {
diff --git a/yarn-project/circuit-types/src/p2p/consensus_payload.ts b/yarn-project/circuit-types/src/p2p/consensus_payload.ts
index d3d13f2d2d0..f6b70a5f354 100644
--- a/yarn-project/circuit-types/src/p2p/consensus_payload.ts
+++ b/yarn-project/circuit-types/src/p2p/consensus_payload.ts
@@ -6,7 +6,7 @@ import { type FieldsOf } from '@aztec/foundation/types';
 import { encodeAbiParameters, parseAbiParameters } from 'viem';
 
 import { TxHash } from '../tx/tx_hash.js';
-import { type Signable } from './signature_utils.js';
+import { type Signable, type SignatureDomainSeperator } from './signature_utils.js';
 
 export class ConsensusPayload implements Signable {
   private size: number | undefined;
@@ -24,10 +24,10 @@ export class ConsensusPayload implements Signable {
     return [fields.header, fields.archive, fields.txHashes] as const;
   }
 
-  getPayloadToSign(): Buffer {
-    const abi = parseAbiParameters('bytes32, bytes32[]');
+  getPayloadToSign(domainSeperator: SignatureDomainSeperator): Buffer {
+    const abi = parseAbiParameters('uint8, bytes32, bytes32[]');
     const txArray = this.txHashes.map(tx => tx.to0xString());
-    const encodedData = encodeAbiParameters(abi, [this.archive.toString(), txArray] as const);
+    const encodedData = encodeAbiParameters(abi, [domainSeperator, this.archive.toString(), txArray] as const);
 
     return Buffer.from(encodedData.slice(2), 'hex');
   }
diff --git a/yarn-project/circuit-types/src/p2p/mocks.ts b/yarn-project/circuit-types/src/p2p/mocks.ts
index 0286c4207ed..821d4fd3b4b 100644
--- a/yarn-project/circuit-types/src/p2p/mocks.ts
+++ b/yarn-project/circuit-types/src/p2p/mocks.ts
@@ -7,7 +7,7 @@ import { TxHash } from '../tx/tx_hash.js';
 import { BlockAttestation } from './block_attestation.js';
 import { BlockProposal } from './block_proposal.js';
 import { ConsensusPayload } from './consensus_payload.js';
-import { getHashedSignaturePayloadEthSignedMessage } from './signature_utils.js';
+import { SignatureDomainSeperator, getHashedSignaturePayloadEthSignedMessage } from './signature_utils.js';
 
 export interface MakeConsensusPayloadOptions {
   signer?: Secp256k1Signer;
@@ -16,7 +16,10 @@ export interface MakeConsensusPayloadOptions {
   txHashes?: TxHash[];
 }
 
-const makeAndSignConsensusPayload = (options?: MakeConsensusPayloadOptions) => {
+const makeAndSignConsensusPayload = (
+  domainSeperator: SignatureDomainSeperator,
+  options?: MakeConsensusPayloadOptions,
+) => {
   const {
     signer = Secp256k1Signer.random(),
     header = makeHeader(1),
@@ -30,19 +33,19 @@ const makeAndSignConsensusPayload = (options?: MakeConsensusPayloadOptions) => {
     txHashes,
   });
 
-  const hash = getHashedSignaturePayloadEthSignedMessage(payload);
+  const hash = getHashedSignaturePayloadEthSignedMessage(payload, domainSeperator);
   const signature = signer.sign(hash);
 
   return { payload, signature };
 };
 
 export const makeBlockProposal = (options?: MakeConsensusPayloadOptions): BlockProposal => {
-  const { payload, signature } = makeAndSignConsensusPayload(options);
+  const { payload, signature } = makeAndSignConsensusPayload(SignatureDomainSeperator.blockProposal, options);
   return new BlockProposal(payload, signature);
 };
 
 // TODO(https://github.com/AztecProtocol/aztec-packages/issues/8028)
 export const makeBlockAttestation = (options?: MakeConsensusPayloadOptions): BlockAttestation => {
-  const { payload, signature } = makeAndSignConsensusPayload(options);
+  const { payload, signature } = makeAndSignConsensusPayload(SignatureDomainSeperator.blockAttestation, options);
   return new BlockAttestation(payload, signature);
 };
diff --git a/yarn-project/circuit-types/src/p2p/signature_utils.ts b/yarn-project/circuit-types/src/p2p/signature_utils.ts
index b06cbdf5f92..25e20ded5d8 100644
--- a/yarn-project/circuit-types/src/p2p/signature_utils.ts
+++ b/yarn-project/circuit-types/src/p2p/signature_utils.ts
@@ -1,8 +1,13 @@
 import { Buffer32 } from '@aztec/foundation/buffer';
 import { keccak256, makeEthSignDigest } from '@aztec/foundation/crypto';
 
+export enum SignatureDomainSeperator {
+  blockProposal = 0,
+  blockAttestation = 1,
+}
+
 export interface Signable {
-  getPayloadToSign(): Buffer;
+  getPayloadToSign(domainSeperator: SignatureDomainSeperator): Buffer;
 }
 
 /**
@@ -10,8 +15,8 @@ export interface Signable {
  * @param s - The `Signable` to sign
  * @returns The hashed payload for the signature of the `Signable`
  */
-export function getHashedSignaturePayload(s: Signable): Buffer32 {
-  return Buffer32.fromBuffer(keccak256(s.getPayloadToSign()));
+export function getHashedSignaturePayload(s: Signable, domainSeperator: SignatureDomainSeperator): Buffer32 {
+  return Buffer32.fromBuffer(keccak256(s.getPayloadToSign(domainSeperator)));
 }
 
 /**
@@ -19,7 +24,10 @@ export function getHashedSignaturePayload(s: Signable): Buffer32 {
  * @param s - the `Signable` to sign
  * @returns The hashed payload for the signature of the `Signable` as an Ethereum signed message
  */
-export function getHashedSignaturePayloadEthSignedMessage(s: Signable): Buffer32 {
-  const payload = getHashedSignaturePayload(s);
+export function getHashedSignaturePayloadEthSignedMessage(
+  s: Signable,
+  domainSeperator: SignatureDomainSeperator,
+): Buffer32 {
+  const payload = getHashedSignaturePayload(s, domainSeperator);
   return makeEthSignDigest(payload);
 }
diff --git a/yarn-project/p2p/src/mem_pools/attestation_pool/mocks.ts b/yarn-project/p2p/src/mem_pools/attestation_pool/mocks.ts
index bf75e7c3905..97bf92329b8 100644
--- a/yarn-project/p2p/src/mem_pools/attestation_pool/mocks.ts
+++ b/yarn-project/p2p/src/mem_pools/attestation_pool/mocks.ts
@@ -1,4 +1,4 @@
-import { BlockAttestation, ConsensusPayload, TxHash } from '@aztec/circuit-types';
+import { BlockAttestation, ConsensusPayload, SignatureDomainSeperator, TxHash } from '@aztec/circuit-types';
 import { makeHeader } from '@aztec/circuits.js/testing';
 import { Signature } from '@aztec/foundation/eth-signature';
 import { Fr } from '@aztec/foundation/fields';
@@ -33,7 +33,9 @@ export const mockAttestation = async (
 
   const payload = new ConsensusPayload(header, archive, txs);
 
-  const message: `0x${string}` = `0x${payload.getPayloadToSign().toString('hex')}`;
+  const message: `0x${string}` = `0x${payload
+    .getPayloadToSign(SignatureDomainSeperator.blockAttestation)
+    .toString('hex')}`;
   const sigString = await signer.signMessage({ message });
 
   const signature = Signature.from0xString(sigString);
diff --git a/yarn-project/sequencer-client/src/publisher/l1-publisher.ts b/yarn-project/sequencer-client/src/publisher/l1-publisher.ts
index 3a1fc87b18e..1553e4e07a5 100644
--- a/yarn-project/sequencer-client/src/publisher/l1-publisher.ts
+++ b/yarn-project/sequencer-client/src/publisher/l1-publisher.ts
@@ -3,6 +3,7 @@ import {
   type EpochProofClaim,
   type EpochProofQuote,
   type L2Block,
+  SignatureDomainSeperator,
   type TxHash,
   getHashedSignaturePayload,
 } from '@aztec/circuit-types';
@@ -464,7 +465,7 @@ export class L1Publisher {
 
     const consensusPayload = new ConsensusPayload(block.header, block.archive.root, txHashes ?? []);
 
-    const digest = getHashedSignaturePayload(consensusPayload);
+    const digest = getHashedSignaturePayload(consensusPayload, SignatureDomainSeperator.blockAttestation);
     const proposeTxArgs = {
       header: block.header.toBuffer(),
       archive: block.archive.root.toBuffer(),
diff --git a/yarn-project/validator-client/src/duties/validation_service.ts b/yarn-project/validator-client/src/duties/validation_service.ts
index 55699c13d51..ee5718b2e00 100644
--- a/yarn-project/validator-client/src/duties/validation_service.ts
+++ b/yarn-project/validator-client/src/duties/validation_service.ts
@@ -1,4 +1,10 @@
-import { BlockAttestation, BlockProposal, ConsensusPayload, type TxHash } from '@aztec/circuit-types';
+import {
+  BlockAttestation,
+  BlockProposal,
+  ConsensusPayload,
+  SignatureDomainSeperator,
+  type TxHash,
+} from '@aztec/circuit-types';
 import { type Header } from '@aztec/circuits.js';
 import { Buffer32 } from '@aztec/foundation/buffer';
 import { keccak256 } from '@aztec/foundation/crypto';
@@ -36,7 +42,9 @@ export class ValidationService {
   async attestToProposal(proposal: BlockProposal): Promise<BlockAttestation> {
     // TODO(https://github.com/AztecProtocol/aztec-packages/issues/7961): check that the current validator is correct
 
-    const buf = Buffer32.fromBuffer(keccak256(proposal.getPayload()));
+    const buf = Buffer32.fromBuffer(
+      keccak256(proposal.payload.getPayloadToSign(SignatureDomainSeperator.blockAttestation)),
+    );
     const sig = await this.keyStore.signMessage(buf);
     return new BlockAttestation(proposal.payload, sig);
   }