diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 2938072..2f117cc 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -100,6 +100,7 @@ jobs:
           tags: ${{ env.IMAGE_NAME }}:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
+          provenance: false
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@v4.0.0
diff --git a/proto/engine/v1/engine.proto b/proto/engine/v1/engine.proto
index f46db16..6974e4f 100644
--- a/proto/engine/v1/engine.proto
+++ b/proto/engine/v1/engine.proto
@@ -20,10 +20,15 @@ service Controller {
 
 /** Supported algorithms. */
 enum Algorithm {
-  ALGORITHM_UNSPECIFIED   = 0;
-  FROST_ED25519           = 1;
-  FROST_SCHNORR_SECP256K1 = 2;
-  CGGMP24_ECDSA_SECP256K1 = 3;
+  /** FROST with ed25519 curve. Signature shares are 64 raw bytes (r ‖ s). */
+  FROST_ED25519 = 0;
+  /** FROST with secp256k1 curve. Signature shares are 64 raw bytes (r ‖ s). */
+  FROST_SCHNORR_SECP256K1 = 1;
+  /** 
+   * CGGMP24 protocol with secp256k1 curve. Signature shares 
+   * are r, s, and recovery id.
+   */
+  CGGMP24_ECDSA_SECP256K1 = 2;
 }
 
 message GenerateKeyRequest {
diff --git a/src/grpc/grpc.types.ts b/src/grpc/grpc.types.ts
index 19da9a2..7dccc8f 100644
--- a/src/grpc/grpc.types.ts
+++ b/src/grpc/grpc.types.ts
@@ -6,10 +6,9 @@ import { type Observable } from "rxjs";
  * Use numeric values so they serialize correctly over gRPC.
  */
 enum Algorithm {
-  ALGORITHM_UNSPECIFIED = 0,
-  FROST_ED25519 = 1,
-  FROST_SCHNORR_SECP256K1 = 2,
-  CGGMP24_ECDSA_SECP256K1 = 3,
+  FROST_ED25519 = 0,
+  FROST_SCHNORR_SECP256K1 = 1,
+  CGGMP24_ECDSA_SECP256K1 = 2,
 }
 
 /**
diff --git a/src/tasks/key-generation/key-generation.dto.ts b/src/tasks/key-generation/key-generation.dto.ts
index 8ddcbb0..19b7897 100644
--- a/src/tasks/key-generation/key-generation.dto.ts
+++ b/src/tasks/key-generation/key-generation.dto.ts
@@ -4,7 +4,6 @@ import {
   IsEnum,
   IsInt,
   IsNotEmpty,
-  IsNotIn,
   IsString,
   Length,
   Matches,
@@ -86,7 +85,6 @@ class KeyGenerationRequestDto {
   })
   @IsEnum(Algorithm)
   @Validate(ThresholdWithinParticipants)
-  @IsNotIn([Algorithm.ALGORITHM_UNSPECIFIED])
   algorithm: Algorithm;
 
   /**