diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8bd32b4f6..eac08a716 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,36 @@ All notable changes to this project will be documented in this file. Dates are d
 
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+#### [v3.0.16-rc3](https://github.com/nevermined-io/sdk-js/compare/v3.0.16-rc2...v3.0.16-rc3)
+
+> 2 July 2024
+
+- fix: webpack error [`d2984be`](https://github.com/nevermined-io/sdk-js/commit/d2984beeaedaea67b1c5fd3deba35eb7d050e745)
+- fix: webpack error [`34fa0f7`](https://github.com/nevermined-io/sdk-js/commit/34fa0f70bad0a89aa3d36d1e168d415ba0868bb5)
+- Automated CHANGELOG.md update [`adde181`](https://github.com/nevermined-io/sdk-js/commit/adde181880e815e6003a13bb67850658e7ff6278)
+
+#### [v3.0.16-rc2](https://github.com/nevermined-io/sdk-js/compare/v3.0.16-rc1...v3.0.16-rc2)
+
+> 1 July 2024
+
+- Automated CHANGELOG.md update [`694ca68`](https://github.com/nevermined-io/sdk-js/commit/694ca680e3ac874fe13b3f37e7f4fda02f7369b9)
+- fix: issue loading nft contract when no artifacts folder [`a285fc0`](https://github.com/nevermined-io/sdk-js/commit/a285fc07738569b1b39c35bca4c6099fa4d5c198)
+
+#### [v3.0.16-rc1](https://github.com/nevermined-io/sdk-js/compare/v3.0.16-rc0...v3.0.16-rc1)
+
+> 28 June 2024
+
+- fix: bug with contracthandler [`e3d3ee6`](https://github.com/nevermined-io/sdk-js/commit/e3d3ee69038e0474ba61e1cde13892b5e8e38bca)
+- Automated CHANGELOG.md update [`8a30fd3`](https://github.com/nevermined-io/sdk-js/commit/8a30fd351f1d84d0247cd4bb669572d28aac03a6)
+
+#### [v3.0.16-rc0](https://github.com/nevermined-io/sdk-js/compare/v3.0.15...v3.0.16-rc0)
+
+> 28 June 2024
+
+- docs: updating documentation [skip actions] [`d1f6dfa`](https://github.com/nevermined-io/sdk-js/commit/d1f6dfa161444337fb8f4e6e633d0de7b5b6c890)
+- docs: updating documentation [skip actions] [`f02e652`](https://github.com/nevermined-io/sdk-js/commit/f02e652883df2e6e6a3c21e2c22650c8fc09d69d)
+- Automated CHANGELOG.md update [`3d02657`](https://github.com/nevermined-io/sdk-js/commit/3d026574f8051d1cb4151e3441edbece52bfb907)
+
 #### [v3.0.15](https://github.com/nevermined-io/sdk-js/compare/v3.0.15-rc3...v3.0.15)
 
 > 26 June 2024
diff --git a/package.json b/package.json
index 72d4c7aa9..b9d3c05be 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@nevermined-io/sdk",
-  "version": "3.0.15",
+  "version": "3.0.16",
   "description": "Javascript SDK for connecting with Nevermined Data Platform ",
   "main": "./dist/node/sdk.js",
   "typings": "./dist/node/sdk.d.ts",
@@ -55,7 +55,7 @@
     "@turnkey/viem": "0.4.16",
     "@zerodev/ecdsa-validator": "5.2.3",
     "@zerodev/sdk": "5.2.11",
-    "@zerodev/session-key": "^5.3.0",
+    "@zerodev/session-key": "5.3.0",
     "assert": "^2.0.0",
     "cross-fetch": "^4.0.0",
     "crypto-browserify": "^3.12.0",
@@ -79,6 +79,7 @@
     "url": "^0.11.0",
     "uuid": "^9.0.1",
     "viem": "2.9.31",
+    "vm-browserify": "^1.1.2",
     "whatwg-url": "^14.0.0"
   },
   "peerDependencies": {
diff --git a/src/common/helpers.ts b/src/common/helpers.ts
index 3942657cd..fd41ee8dc 100644
--- a/src/common/helpers.ts
+++ b/src/common/helpers.ts
@@ -86,18 +86,18 @@ export async function decryptMessage(encryptedMessage: string, privateKey: strin
 }
 
 export function serializeECIES(ecies: any) {
-  return btoa(
-    JSON.stringify({
-      iv: Buffer.from(ecies.iv).toString('base64'),
-      ephemPublicKey: Buffer.from(ecies.ephemPublicKey).toString('base64'),
-      ciphertext: Buffer.from(ecies.ciphertext).toString('base64'),
-      mac: Buffer.from(ecies.mac).toString('base64'),
-    }),
-  )
+  const serialized = JSON.stringify({
+    iv: Buffer.from(ecies.iv).toString('base64'),
+    ephemPublicKey: Buffer.from(ecies.ephemPublicKey).toString('base64'),
+    ciphertext: Buffer.from(ecies.ciphertext).toString('base64'),
+    mac: Buffer.from(ecies.mac).toString('base64'),
+  })
+  return Buffer.from(serialized).toString('binary')
 }
 
 export function deserializeECIES(serialized: any) {
-  const _obj = JSON.parse(atob(serialized))
+  const decoded = Buffer.from(serialized, 'binary').toString()
+  const _obj = JSON.parse(decoded)
   return {
     iv: Buffer.from(_obj.iv, 'base64'),
     ephemPublicKey: Buffer.from(_obj.ephemPublicKey, 'base64'),
diff --git a/src/keeper/ContractHandler.ts b/src/keeper/ContractHandler.ts
index 7e74af348..1c8cd6415 100644
--- a/src/keeper/ContractHandler.ts
+++ b/src/keeper/ContractHandler.ts
@@ -160,7 +160,12 @@ export class ContractHandler extends Instantiable {
       if (networkName && networkName.length > 0) where = `.${networkName}`
 
       if (artifactsFolder.startsWith('http')) {
-        const path = `${artifactsFolder}/${networkId}/public/${contractsVersion}/${contractName}${where}.json`
+        let path
+        if (artifactsFolder === 'https://artifacts.nevermined.network') {
+          path = `${artifactsFolder}/${networkId}/public/${contractsVersion}/${contractName}${where}.json`
+        } else {
+          path = `${artifactsFolder}/${contractName}${where}.json`
+        }
         const jsonFile = await fetch(path, {
           method: 'GET',
           headers: { 'Content-type': 'application/json' },
diff --git a/src/keeper/contracts/Nft1155Contract.ts b/src/keeper/contracts/Nft1155Contract.ts
index 0a9cef9c4..3ec5f3455 100644
--- a/src/keeper/contracts/Nft1155Contract.ts
+++ b/src/keeper/contracts/Nft1155Contract.ts
@@ -23,6 +23,7 @@ export class Nft1155Contract extends NFTContractsBase {
 
     if (address) {
       const networkName = await nft.nevermined.keeper.getNetworkName()
+      const networkId = await nft.nevermined.keeper.getNetworkId()
 
       // We don't have a subgraph for NFT1155 so we can only use ContractEvent
       const eventEmitter = new EventHandler()
@@ -32,6 +33,7 @@ export class Nft1155Contract extends NFTContractsBase {
         contractName,
         artifactsFolder,
         networkName,
+        networkId,
       )
 
       nft.contract = await getContractInstance(address, solidityABI.abi, nft.client)
diff --git a/src/keeper/contracts/Nft721Contract.ts b/src/keeper/contracts/Nft721Contract.ts
index ba633a4f7..4211426c1 100644
--- a/src/keeper/contracts/Nft721Contract.ts
+++ b/src/keeper/contracts/Nft721Contract.ts
@@ -18,6 +18,7 @@ export class Nft721Contract extends NFTContractsBase {
     const nft: Nft721Contract = new Nft721Contract(contractName)
     nft.setInstanceConfig(config)
     const networkName = await nft.nevermined.keeper.getNetworkName()
+    const networkId = await nft.nevermined.keeper.getNetworkId()
 
     // We don't have a subgraph for NFT721 so we can only use ContractEvent
     const eventEmitter = new EventHandler()
@@ -27,6 +28,7 @@ export class Nft721Contract extends NFTContractsBase {
       contractName,
       artifactsFolder,
       networkName,
+      networkId,
     )
 
     nft.contract = await getContractInstance(address, solidityABI.abi, nft.nevermined.client)
diff --git a/webpack.common.js b/webpack.common.js
index 9f9d2ebf6..058b8af61 100644
--- a/webpack.common.js
+++ b/webpack.common.js
@@ -21,6 +21,7 @@ module.exports = {
       assert: require.resolve('assert/'),
       path: require.resolve('path-browserify'),
       stream: require.resolve('stream-browserify'),
+      vm: require.resolve("vm-browserify"),
       zlib: false,
       fs: false,
     },
diff --git a/yarn.lock b/yarn.lock
index b98dfb604..745de5020 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2594,7 +2594,7 @@
   dependencies:
     semver "^7.6.0"
 
-"@zerodev/session-key@^5.3.0":
+"@zerodev/session-key@5.3.0":
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/@zerodev/session-key/-/session-key-5.3.0.tgz#d347134a359d06ec03f6bb8378345d5d2d3f4c22"
   integrity sha512-HZAFuhUiiG2bx8fqBW1LujH7Rn8zdbraipOoFXh55tDTyA3GX6M4RgiqzZPRoHMYfCYImE6ETBj0a97PjsBRHQ==
@@ -11260,6 +11260,11 @@ viem@2.9.31:
     isows "1.0.3"
     ws "8.13.0"
 
+vm-browserify@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/vm-browserify/-/vm-browserify-1.1.2.tgz#78641c488b8e6ca91a75f511e7a3b32a86e5dda0"
+  integrity sha512-2ham8XPWTONajOR0ohOKOHXkm3+gaBmGut3SRuu75xLd/RRaY6vqgh8NBYYk7+RW3u5AtzPQZG8F10LHkl0lAQ==
+
 vscode-oniguruma@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/vscode-oniguruma/-/vscode-oniguruma-1.7.0.tgz#439bfad8fe71abd7798338d1cd3dc53a8beea94b"