diff --git a/src/client.ts b/src/client.ts
index f1f7295f..02ce76c9 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -5,7 +5,7 @@ import { Buffer } from 'buffer';
 import invariant from 'tiny-invariant';
 import { AccountCore } from './core/account';
 import { ElectionCore } from './core/election';
-import { VoteCore } from './core/vote';
+import { CspProofType, VoteCore } from './core/vote';
 import {
   Account,
   AllElectionStatus,
@@ -863,6 +863,7 @@ export class VocdoniSDKClient {
       censusProof = {
         address: await this.wallet.getAddress(),
         signature: vote.signature,
+        proof_type: vote.proof_type,
       };
       yield {
         key: VoteSteps.GET_PROOF,
@@ -1005,8 +1006,8 @@ export class VocdoniSDKClient {
     return this.cspService.cspSign(this.electionId, address, token);
   }
 
-  cspVote(vote: Vote, signature: string) {
-    return this.cspService.cspVote(vote, signature);
+  cspVote(vote: Vote, signature: string, proof_type?: CspProofType) {
+    return this.cspService.cspVote(vote, signature, proof_type);
   }
 
   /**
diff --git a/src/core/vote.ts b/src/core/vote.ts
index eecc3d74..28820fe4 100644
--- a/src/core/vote.ts
+++ b/src/core/vote.ts
@@ -31,6 +31,13 @@ export type VotePackage = {
   votes: VoteValues;
 };
 
+export enum CspProofType {
+  ECDSA = ProofCA_Type.ECDSA,
+  ECDSA_PIDSALTED = ProofCA_Type.ECDSA_PIDSALTED,
+  ECDSA_BLIND = ProofCA_Type.ECDSA_BLIND,
+  ECDSA_BLIND_PIDSALTED = ProofCA_Type.ECDSA_BLIND_PIDSALTED,
+}
+
 export abstract class VoteCore extends TransactionCore {
   /**
    * Cannot be constructed.
@@ -130,7 +137,7 @@ export abstract class VoteCore extends TransactionCore {
 
       // Populate the proof
       const caProof = ProofCA.fromPartial({
-        type: ProofCA_Type.ECDSA_BLIND_PIDSALTED,
+        type: proof.proof_type ? (proof.proof_type as unknown as ProofCA_Type) : ProofCA_Type.ECDSA_BLIND_PIDSALTED,
         signature: new Uint8Array(Buffer.from(strip0x(proof.signature), 'hex')),
         bundle: this.cspCaBundle(electionId, proof.address),
       });
diff --git a/src/services/census.ts b/src/services/census.ts
index 503f8799..55357927 100644
--- a/src/services/census.ts
+++ b/src/services/census.ts
@@ -3,6 +3,7 @@ import { CensusType, ICensusParticipant, PlainCensus, WeightedCensus } from '../
 import { CensusAPI, ICensusImportResponse, ICensusPublishResponse, WalletAPI } from '../api';
 import { Wallet } from '@ethersproject/wallet';
 import invariant from 'tiny-invariant';
+import { CspProofType } from '../core/vote';
 
 interface CensusServiceProperties {
   auth: CensusAuth;
@@ -57,6 +58,7 @@ export type CspCensusProof = {
   address: string;
   signature: string;
   weight?: bigint;
+  proof_type?: CspProofType;
 };
 
 export class CensusService extends Service implements CensusServiceProperties {
diff --git a/src/services/csp.ts b/src/services/csp.ts
index e3e0c126..0a0e9e01 100644
--- a/src/services/csp.ts
+++ b/src/services/csp.ts
@@ -3,6 +3,7 @@ import invariant from 'tiny-invariant';
 import { CensusType, CspVote, Election, Vote } from '../types';
 import { CspAPI, ICspInfoResponse } from '../api/csp';
 import { CensusBlind, getBlindedPayload } from '../util/blind-signing';
+import { CspProofType } from '../core/vote';
 
 interface CspServiceProperties {
   info: ICspInfoResponse;
@@ -64,11 +65,11 @@ export class CspService extends Service implements CspServiceProperties {
     );
   }
 
-  cspVote(vote: Vote, signature: string): CspVote {
-    return CspService.cspVote(vote, signature);
+  cspVote(vote: Vote, signature: string, proof_type?: CspProofType): CspVote {
+    return CspService.cspVote(vote, signature, proof_type);
   }
 
-  static cspVote(vote: Vote, signature: string): CspVote {
-    return new CspVote(vote.votes, signature);
+  static cspVote(vote: Vote, signature: string, proof_type?: CspProofType): CspVote {
+    return new CspVote(vote.votes, signature, proof_type);
   }
 }
diff --git a/src/types/vote/csp.ts b/src/types/vote/csp.ts
index 3b2bfca0..7f0923be 100644
--- a/src/types/vote/csp.ts
+++ b/src/types/vote/csp.ts
@@ -1,17 +1,21 @@
 import { Vote } from './vote';
+import { CspProofType } from '../../core/vote';
 
 export class CspVote extends Vote {
   private _signature: string;
+  private _proof_type: CspProofType;
 
   /**
    * Constructs a csp vote
    *
    * @param votes The list of votes values
    * @param signature The CSP signature
+   * @param proof_type The CSP proof type
    */
-  public constructor(votes: Array<number | bigint>, signature: string) {
+  public constructor(votes: Array<number | bigint>, signature: string, proof_type?: CspProofType) {
     super(votes);
     this.signature = signature;
+    this.proof_type = proof_type;
   }
 
   get signature(): string {
@@ -21,4 +25,12 @@ export class CspVote extends Vote {
   set signature(value: string) {
     this._signature = value;
   }
+
+  get proof_type(): CspProofType {
+    return this._proof_type;
+  }
+
+  set proof_type(value: CspProofType) {
+    this._proof_type = value;
+  }
 }
diff --git a/test/integration/csp.test.ts b/test/integration/csp.test.ts
index b56f5c7d..b3be6a92 100644
--- a/test/integration/csp.test.ts
+++ b/test/integration/csp.test.ts
@@ -6,6 +6,7 @@ import { CspCensus } from '../../src';
 import { clientParams, setFaucetURL } from './util/client.params';
 // @ts-ignore
 import { waitForElectionReady } from './util/client.utils';
+import { CspProofType } from '../../src/core/vote';
 
 const CSP_URL = process.env.BLINDCSP_URL ?? 'https://csp-dev-simplemath.vocdoni.net/v1';
 const CSP_PUBKEY = process.env.BLINDCSP_PUBKEY ?? '025de8cb8de1005aa939c1403e37e1fa165ebc758da49cb37215c6237d01591104';
@@ -66,7 +67,7 @@ describe('CSP tests', () => {
               step0.authToken
             )) as ICspFinalStepResponse;
             const signature = await pClient.cspSign(participant.address, step1.token);
-            const vote = pClient.cspVote(new Vote([index % 2]), signature);
+            const vote = pClient.cspVote(new Vote([index % 2]), signature, CspProofType.ECDSA_BLIND_PIDSALTED);
             return pClient.submitVote(vote);
           })
         );