MeshJS · twwu123 · May 21, 2026 · May 18, 2026 · May 18, 2026 · May 21, 2026
diff --git a/package-lock.json b/package-lock.json
diff --git a/packages/mesh-common/package.json b/packages/mesh-common/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@meshsdk/common",
-  "version": "1.9.0-beta.102",
+  "version": "1.9.0-beta.103",
   "description": "Contains constants, types and interfaces used across the SDK and different serialization libraries",
   "main": "./dist/index.cjs",
   "browser": "./dist/index.js",

diff --git a/packages/mesh-common/src/interfaces/fetcher.ts b/packages/mesh-common/src/interfaces/fetcher.ts
@@ -40,6 +40,7 @@ export interface IFetcher {
     cursor?: number | string,
   ): Promise<{ assets: Asset[]; next?: string | number | null }>;
   fetchProtocolParameters(epoch: number): Promise<Protocol>;
+  fetchCostModels(epoch?: number): Promise<number[][]>;
   fetchTxInfo(hash: string): Promise<TransactionInfo>;
   fetchUTxOs(hash: string, index?: number): Promise<UTxO[]>;
   fetchGovernanceProposal(

diff --git a/packages/mesh-contract/package.json b/packages/mesh-contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@meshsdk/contract",
-  "version": "1.9.0-beta.102",
+  "version": "1.9.0-beta.103",
   "description": "List of open-source smart contracts, complete with documentation, live demos, and end-to-end source code. https://meshjs.dev/smart-contracts",
   "main": "./dist/index.cjs",
   "browser": "./dist/index.js",
@@ -34,8 +34,8 @@
     "typescript": "^5.3.3"
   },
   "dependencies": {
-    "@meshsdk/common": "1.9.0-beta.102",
-    "@meshsdk/core": "1.9.0-beta.102"
+    "@meshsdk/common": "1.9.0-beta.103",
+    "@meshsdk/core": "1.9.0-beta.103"
   },
   "prettier": "@meshsdk/configs/prettier",
   "publishConfig": {

diff --git a/packages/mesh-core-csl/package.json b/packages/mesh-core-csl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@meshsdk/core-csl",
-  "version": "1.9.0-beta.102",
+  "version": "1.9.0-beta.103",
   "description": "Types and utilities functions between Mesh and cardano-serialization-lib",
   "main": "./dist/index.cjs",
   "module": "./dist/index.js",
@@ -38,7 +38,7 @@
     "typescript": "^5.3.3"
   },
   "dependencies": {
-    "@meshsdk/common": "1.9.0-beta.102",
+    "@meshsdk/common": "1.9.0-beta.103",
     "@sidan-lab/whisky-js-browser": "^1.0.11",
     "@sidan-lab/whisky-js-nodejs": "^1.0.11",
     "@types/base32-encoding": "^1.0.2",

diff --git a/packages/mesh-core-cst/package.json b/packages/mesh-core-cst/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@meshsdk/core-cst",
-  "version": "1.9.0-beta.102",
+  "version": "1.9.0-beta.103",
   "description": "Types and utilities functions between Mesh and cardano-js-sdk",
   "main": "./dist/index.cjs",
   "browser": "./dist/index.js",
@@ -44,14 +44,13 @@
     "@harmoniclabs/pair": "^1.0.0",
     "@harmoniclabs/plutus-data": "1.2.6",
     "@harmoniclabs/uplc": "1.4.1",
-    "@meshsdk/common": "1.9.0-beta.102",
+    "@meshsdk/common": "1.9.0-beta.103",
     "@types/base32-encoding": "^1.0.2",
     "base32-encoding": "^1.0.0",
     "bech32": "^2.0.0",
     "blakejs": "^1.2.1",
     "bn.js": "^5.2.0",
-    "hash.js": "^1.1.7",
-    "scalus": "^0.17.0"
+    "hash.js": "^1.1.7"
   },
   "overrides": {
     "@cardano-sdk/crypto": {

diff --git a/packages/mesh-core-cst/src/serializer/index.ts b/packages/mesh-core-cst/src/serializer/index.ts
@@ -124,13 +124,13 @@ import {
 } from "../utils";
 import { toCardanoCert } from "../utils/certificate";
 import { toCardanoMetadataMap } from "../utils/metadata";
+import { toCardanoProposalProcedure } from "../utils/proposal";
 import { hashScriptData } from "../utils/script-data-hash";
 import {
   toCardanoGovernanceActionId,
   toCardanoVoter,
   toCardanoVotingProcedure,
 } from "../utils/vote";
-import { toCardanoProposalProcedure } from "../utils/proposal";
 
 const VKEY_PUBKEY_SIZE_BYTES = 32;
 const VKEY_SIGNATURE_SIZE_BYTES = 64;
@@ -443,7 +443,6 @@ export class CardanoSDKSerializer implements IMeshTxSerializer {
     const serializerCore = new CardanoSDKSerializerCore(
       protocolParams ?? this.protocolParams,
     );
-
     return serializerCore.coreSerializeTx(txBuilderBody);
   };
 
@@ -728,7 +727,15 @@ class CardanoSDKSerializerCore {
     if (txBuilderBody.fee !== undefined) {
       this.txBody.setFee(BigInt(txBuilderBody.fee));
     }
-    this.buildWitnessSet();
+
+    const setCostModels = Array.isArray(txBuilderBody.network)
+      ? txBuilderBody.network
+      : [
+          DEFAULT_V1_COST_MODEL_LIST,
+          DEFAULT_V2_COST_MODEL_LIST,
+          DEFAULT_V3_COST_MODEL_LIST,
+        ];
+    this.buildWitnessSet(setCostModels);
     return new Transaction(
       bodyCore,
       this.txWitnessSet,
@@ -738,9 +745,17 @@ class CardanoSDKSerializerCore {
 
   coreSerializeTxWithMockSignatures(txBuilderBody: MeshTxBuilderBody): string {
     const bodyCore = this.coreSerializeTxBody(txBuilderBody);
+    const setCostModels = Array.isArray(txBuilderBody.network)
+      ? txBuilderBody.network
+      : [
+          DEFAULT_V1_COST_MODEL_LIST,
+          DEFAULT_V2_COST_MODEL_LIST,
+          DEFAULT_V3_COST_MODEL_LIST,
+        ];
     const mockWitSet = this.createMockedWitnessSet(
       txBuilderBody.expectedNumberKeyWitnesses,
       txBuilderBody.expectedByronAddressWitnesses,
+      setCostModels,
     );
     return new Transaction(
       bodyCore,
@@ -1449,8 +1464,9 @@ class CardanoSDKSerializerCore {
   private createMockedWitnessSet = (
     requiredSignaturesCount: number,
     requiredByronSignatures: string[],
+    setCostModels: number[][],
   ): TransactionWitnessSet => {
-    this.buildWitnessSet();
+    this.buildWitnessSet(setCostModels);
     const clonedWitnessSet = TransactionWitnessSet.fromCbor(
       this.txWitnessSet.toCbor(),
     );
@@ -1470,7 +1486,7 @@ class CardanoSDKSerializerCore {
     return clonedWitnessSet;
   };
 
-  private buildWitnessSet = () => {
+  private buildWitnessSet = (setCostModels: number[][]) => {
     // Add provided scripts to tx witness set
     let nativeScripts =
       this.txWitnessSet.nativeScripts() ??
@@ -1529,13 +1545,13 @@ class CardanoSDKSerializerCore {
     // After building tx witness set, we must hash it with the cost models
     // and put the hash in the tx body
     let costModelV1 = Serialization.CostModel.newPlutusV1(
-      DEFAULT_V1_COST_MODEL_LIST,
+      setCostModels[0] ?? DEFAULT_V1_COST_MODEL_LIST,
     );
     let costModelV2 = Serialization.CostModel.newPlutusV2(
-      DEFAULT_V2_COST_MODEL_LIST,
+      setCostModels[1] ?? DEFAULT_V2_COST_MODEL_LIST,
     );
     let costModelV3 = Serialization.CostModel.newPlutusV3(
-      DEFAULT_V3_COST_MODEL_LIST,
+      setCostModels[2] ?? DEFAULT_V3_COST_MODEL_LIST,
     );
     let costModels = new Serialization.Costmdls();
 
@@ -1805,8 +1821,8 @@ class CardanoSDKSerializerCore {
 
   private addBasicProposal = (proposal: Proposal) => {
     const currentProcedures = this.txBody.proposalProcedures();
-    const proposalProcedures = currentProcedures 
-      ? [...currentProcedures.values()] 
+    const proposalProcedures = currentProcedures
+      ? [...currentProcedures.values()]
       : [];
 
     const proposalProcedure = toCardanoProposalProcedure(
@@ -1819,9 +1835,9 @@ class CardanoSDKSerializerCore {
     proposalProcedures.push(proposalProcedure);
     this.txBody.setProposalProcedures(
       CborSet.fromCore(
-        proposalProcedures.map(p => p.toCore()),
+        proposalProcedures.map((p) => p.toCore()),
         Serialization.ProposalProcedure.fromCore,
-      )
+      ),
     );
   };
 

diff --git a/packages/mesh-core/package.json b/packages/mesh-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@meshsdk/core",
-  "version": "1.9.0-beta.102",
+  "version": "1.9.0-beta.103",
   "description": "Mesh SDK Core - https://meshjs.dev/",
   "main": "./dist/index.cjs",
   "browser": "./dist/index.js",
@@ -33,11 +33,11 @@
     "typescript": "^5.3.3"
   },
   "dependencies": {
-    "@meshsdk/common": "1.9.0-beta.102",
-    "@meshsdk/core-cst": "1.9.0-beta.102",
-    "@meshsdk/provider": "1.9.0-beta.100",
-    "@meshsdk/transaction": "1.9.0-beta.102",
-    "@meshsdk/wallet": "1.9.0-beta.102",
+    "@meshsdk/common": "1.9.0-beta.103",
+    "@meshsdk/core-cst": "1.9.0-beta.103",
+    "@meshsdk/provider": "1.9.0-beta.101",
+    "@meshsdk/transaction": "1.9.0-beta.103",
+    "@meshsdk/wallet": "1.9.0-beta.103",
     "scalus": "^0.17.0"
   },
   "prettier": "@meshsdk/configs/prettier",