diff --git a/packages/web3/src/api/node-provider.ts b/packages/web3/src/api/node-provider.ts
index e6b23fe16..935c27568 100644
--- a/packages/web3/src/api/node-provider.ts
+++ b/packages/web3/src/api/node-provider.ts
@@ -28,7 +28,6 @@ import {
   requestWithLog
 } from './types'
 import { Api as NodeApi, CallContractFailed, CallContractSucceeded } from './api-alephium'
-import { tryGetCallResult } from '../contract'
 import {
   HexString,
   addressFromContractId,
@@ -38,6 +37,7 @@ import {
   isHexString,
   toNonNegativeBigInt
 } from '../utils'
+import * as node from '../api/api-alephium'
 
 function initializeNodeApi(baseUrl: string, apiKey?: string, customFetch?: typeof fetch): NodeApi<string> {
   const nodeApi = new NodeApi<string>({
@@ -253,3 +253,10 @@ export class NodeProvider implements NodeProviderApis {
     }
   }
 }
+
+export function tryGetCallResult(result: node.CallContractResult): node.CallContractSucceeded {
+  if (result.type === 'CallContractFailed') {
+    throw new Error(`Failed to call contract, error: ${(result as node.CallContractFailed).error}`)
+  }
+  return result as node.CallContractSucceeded
+}
diff --git a/packages/web3/src/api/utils.ts b/packages/web3/src/api/utils.ts
index 88cb848ff..30b7be173 100644
--- a/packages/web3/src/api/utils.ts
+++ b/packages/web3/src/api/utils.ts
@@ -17,7 +17,7 @@ along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
 import 'cross-fetch/polyfill'
-import { node } from '..'
+import * as node from '../api/api-alephium'
 
 export function convertHttpResponse<T>(response: { status: number; data: T; error?: { detail: string } }): T {
   if (response.error) {
diff --git a/packages/web3/src/codec/contract-output-codec.ts b/packages/web3/src/codec/contract-output-codec.ts
index dcf86c970..ab75420b3 100644
--- a/packages/web3/src/codec/contract-output-codec.ts
+++ b/packages/web3/src/codec/contract-output-codec.ts
@@ -24,7 +24,7 @@ import { Codec } from './codec'
 import { Token, tokensCodec } from './token-codec'
 import { ContractOutput as ApiContractOutput } from '../api/api-alephium'
 import { blakeHash, createHint } from './hash'
-import { binToHex, bs58 } from '..'
+import { binToHex, bs58 } from '../utils'
 import { signedIntCodec } from './signed-int-codec'
 import { lockupScriptCodec } from './lockup-script-codec'
 
diff --git a/packages/web3/src/codec/lockup-script-codec.ts b/packages/web3/src/codec/lockup-script-codec.ts
index c98cfddfd..644a5686d 100644
--- a/packages/web3/src/codec/lockup-script-codec.ts
+++ b/packages/web3/src/codec/lockup-script-codec.ts
@@ -17,7 +17,7 @@ along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 import { Buffer } from 'buffer/'
 import { Parser } from 'binary-parser'
-import { DecodedCompactInt, compactUnsignedIntCodec } from './compact-int-codec'
+import { DecodedCompactInt, compactSignedIntCodec } from './compact-int-codec'
 import { Codec } from './codec'
 import { ArrayCodec, DecodedArray } from './array-codec'
 
@@ -41,7 +41,7 @@ const publicKeyHashCodec = new PublicKeyHashCodec()
 const publicKeyHashesCodec = new ArrayCodec(publicKeyHashCodec)
 const multiSigParser = Parser.start()
   .nest('publicKeyHashes', { type: publicKeyHashesCodec.parser })
-  .nest('m', { type: compactUnsignedIntCodec.parser })
+  .nest('m', { type: compactSignedIntCodec.parser })
 export interface MultiSig {
   publicKeyHashes: DecodedArray<PublicKeyHash>
   m: DecodedCompactInt
@@ -79,7 +79,7 @@ export class LockupScriptCodec implements Codec<LockupScript> {
       result.push(...(input.script as PublicKeyHash).publicKeyHash)
     } else if (input.scriptType === 1) {
       result.push(...publicKeyHashesCodec.encode((input.script as MultiSig).publicKeyHashes.value))
-      result.push(...compactUnsignedIntCodec.encode((input.script as MultiSig).m))
+      result.push(...compactSignedIntCodec.encode((input.script as MultiSig).m))
     } else if (input.scriptType === 2) {
       result.push(...(input.script as P2SH).scriptHash)
     } else if (input.scriptType === 3) {
diff --git a/packages/web3/src/codec/transaction-codec.ts b/packages/web3/src/codec/transaction-codec.ts
index d48790a0f..4acc2d36e 100644
--- a/packages/web3/src/codec/transaction-codec.ts
+++ b/packages/web3/src/codec/transaction-codec.ts
@@ -27,7 +27,7 @@ import { Either } from './either-codec'
 import { AssetOutput, AssetOutputCodec } from './asset-output-codec'
 import { ContractOutput, ContractOutputCodec } from './contract-output-codec'
 import { FixedAssetOutput, Transaction as ApiTransaction } from '../api/api-alephium'
-import { hexToBinUnsafe } from '..'
+import { hexToBinUnsafe } from '../utils'
 import { ContractOutput as ApiContractOutput } from '../api/api-alephium'
 import { Codec } from './codec'
 import { Output, outputCodec, outputsCodec } from './output-codec'
diff --git a/packages/web3/src/contract/contract.ts b/packages/web3/src/contract/contract.ts
index 0cb6b37b5..ff9bf9e33 100644
--- a/packages/web3/src/contract/contract.ts
+++ b/packages/web3/src/contract/contract.ts
@@ -34,7 +34,8 @@ import {
   getDefaultPrimitiveValue,
   PrimitiveTypes,
   decodeArrayType,
-  fromApiPrimitiveVal
+  fromApiPrimitiveVal,
+  tryGetCallResult
 } from '../api'
 import { CompileProjectResult } from '../api/api-alephium'
 import {
@@ -2369,10 +2370,3 @@ export const getContractIdFromUnsignedTx = async (
 
 // This function only works in the simple case where a single non-subcontract is created in the tx
 export const getTokenIdFromUnsignedTx = getContractIdFromUnsignedTx
-
-export function tryGetCallResult(result: node.CallContractResult): node.CallContractSucceeded {
-  if (result.type === 'CallContractFailed') {
-    throw new Error(`Failed to call contract, error: ${(result as node.CallContractFailed).error}`)
-  }
-  return result as node.CallContractSucceeded
-}
diff --git a/packages/web3/src/contract/events.ts b/packages/web3/src/contract/events.ts
index 976006dd5..5513eca61 100644
--- a/packages/web3/src/contract/events.ts
+++ b/packages/web3/src/contract/events.ts
@@ -16,7 +16,7 @@ You should have received a copy of the GNU Lesser General Public License
 along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
-import { web3 } from '..'
+import * as web3 from '../global'
 import { node } from '../api'
 import { Subscription, SubscribeOptions } from '../utils'
 
diff --git a/packages/web3/src/contract/ralph.test.ts b/packages/web3/src/contract/ralph.test.ts
index 3d535a787..1ac32f46e 100644
--- a/packages/web3/src/contract/ralph.test.ts
+++ b/packages/web3/src/contract/ralph.test.ts
@@ -19,7 +19,7 @@ along with the library. If not, see <http://www.gnu.org/licenses/>.
 import * as ralph from './ralph'
 import * as utils from '../utils'
 import { Fields, FieldsSig, Struct, fromApiArray, fromApiEventFields, fromApiFields, getDefaultValue } from './contract'
-import { node } from '..'
+import * as node from '../api/api-alephium'
 
 describe('contract', function () {
   it('should encode I256', () => {
diff --git a/packages/web3/src/signer/tx-builder.ts b/packages/web3/src/signer/tx-builder.ts
index df108870b..e04fdde85 100644
--- a/packages/web3/src/signer/tx-builder.ts
+++ b/packages/web3/src/signer/tx-builder.ts
@@ -16,7 +16,7 @@ You should have received a copy of the GNU Lesser General Public License
 along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
-import { utils } from '..'
+import { binToHex, contractIdFromAddress } from '../utils'
 import { fromApiNumber256, node, NodeProvider, toApiNumber256Optional, toApiTokens } from '../api'
 import { addressFromPublicKey } from '../utils'
 import { toApiDestinations } from './signer'
@@ -90,7 +90,7 @@ export abstract class TransactionBuilder {
       ...rest
     }
     const response = await this.nodeProvider.contracts.postContractsUnsignedTxDeployContract(data)
-    const contractId = utils.binToHex(utils.contractIdFromAddress(response.contractAddress))
+    const contractId = binToHex(contractIdFromAddress(response.contractAddress))
     return { ...response, groupIndex: response.fromGroup, contractId, gasPrice: fromApiNumber256(response.gasPrice) }
   }
 
diff --git a/packages/web3/src/transaction/status.ts b/packages/web3/src/transaction/status.ts
index b0e38ee72..24a54217e 100644
--- a/packages/web3/src/transaction/status.ts
+++ b/packages/web3/src/transaction/status.ts
@@ -16,7 +16,7 @@ You should have received a copy of the GNU Lesser General Public License
 along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
-import { web3 } from '..'
+import * as web3 from '../global'
 import { node } from '../api'
 import { Subscription, SubscribeOptions } from '../utils'
 
diff --git a/packages/web3/src/utils/address.test.ts b/packages/web3/src/utils/address.test.ts
index 39bcbd9e5..414b8a058 100644
--- a/packages/web3/src/utils/address.test.ts
+++ b/packages/web3/src/utils/address.test.ts
@@ -46,6 +46,10 @@ describe('address', function () {
     expect(() => validateAddress('eBrjfQNeyUCuxE4zpbfMZcbS3PuvbMJDQBCyk4HRHtX')).toThrow('Invalid address:')
     expect(validateAddress('yya86C6UemCeLs5Ztwjcf2Mp2Kkt4mwzzRpBiG6qQ9kj')).toBeUndefined()
     expect(() => validateAddress('yya86C6UemCeLs5Ztwjcf2Mp2Kkt4mwzzRpBiG6qQ9k')).toThrow('Invalid address:')
+    expect(() => validateAddress('asd')).toThrow('Invalid multisig address: asd')
+    expect(() =>
+      validateAddress('2jVWAcAPphJ8ueZNG1BPwbfPFjjbvorprceuqzgmJQ1ZRyELRpWgARvdB3T9trqpiJs7f4GkudPt6rQLnGbQYqq2NCi')
+    ).toThrow('Invalid multisig address, n: 2, m: 3')
   })
 
   it('should get address type', () => {
diff --git a/packages/web3/src/utils/address.ts b/packages/web3/src/utils/address.ts
index fa8d780fa..e5b780896 100644
--- a/packages/web3/src/utils/address.ts
+++ b/packages/web3/src/utils/address.ts
@@ -24,6 +24,9 @@ import bs58 from './bs58'
 import djb2 from './djb2'
 import { binToHex, hexToBinUnsafe } from './utils'
 import { KeyType } from '../signer'
+import { MultiSig, lockupScriptCodec } from '../codec/lockup-script-codec'
+import { Buffer } from 'buffer/'
+import { compactSignedIntCodec } from '../codec'
 
 const ec = new EC('secp256k1')
 
@@ -49,8 +52,18 @@ function decodeAndValidateAddress(address: string): Uint8Array {
   if (decoded.length === 0) throw new Error('Address is empty')
   const addressType = decoded[0]
   if (addressType === AddressType.P2MPKH) {
-    // [1, n, ...hashes, m]
-    if ((decoded.length - 3) % 32 === 0) return decoded
+    let multisig: MultiSig
+    try {
+      multisig = lockupScriptCodec.decode(Buffer.from(decoded)).script as MultiSig
+    } catch (_) {
+      throw new Error(`Invalid multisig address: ${address}`)
+    }
+    const n = multisig.publicKeyHashes.value.length
+    const m = compactSignedIntCodec.toI32(multisig.m)
+    if (n < m) {
+      throw new Error(`Invalid multisig address, n: ${n}, m: ${m}`)
+    }
+    return decoded
   } else if (addressType === AddressType.P2PKH || addressType === AddressType.P2SH || addressType === AddressType.P2C) {
     // [type, ...hash]
     if (decoded.length === 33) return decoded
diff --git a/packages/web3/src/utils/exchange.test.ts b/packages/web3/src/utils/exchange.test.ts
index 631ce4caf..8dbde49f8 100644
--- a/packages/web3/src/utils/exchange.test.ts
+++ b/packages/web3/src/utils/exchange.test.ts
@@ -29,15 +29,26 @@ import { NodeProvider } from '../api'
 
 describe('exchange', function () {
   it('should get address from unlock script', () => {
+    expect(() =>
+      getAddressFromUnlockScript('0003498dc83e77e9b5c82b88e2bba7c737fd5aee041dc6bbb4402fefa3e7460a95bz')
+    ).toThrow(`expected a hex string`)
     expect(getAddressFromUnlockScript('0003498dc83e77e9b5c82b88e2bba7c737fd5aee041dc6bbb4402fefa3e7460a95bb')).toEqual(
       '18Y5mtrpu9kaEW9PoyipNQcFwVtA8X5yrGYhTZwYBwXHN'
     )
+    expect(() =>
+      getAddressFromUnlockScript('0003498dc83e77e9b5c82b88e2bba7c737fd5aee041dc6bbb4402fefa3e7460a95')
+    ).toThrow('Invalid p2pkh unlock script')
 
     expect(
       getAddressFromUnlockScript(
         '0201010000000004581440200000000000000000000000000000000000000000000000000000000000000000868500'
       )
     ).toEqual('qCG5ZXg3b7AuGDS4HoEAhzqhCc2yxMqBYjYimBj1QFFT')
+    expect(() =>
+      getAddressFromUnlockScript(
+        '02010100000000045814402000000000000000000000000000000000000000000000000000000000000000008685'
+      )
+    ).toThrow('Invalid p2sh unlock script')
 
     expect(() =>
       getAddressFromUnlockScript(
diff --git a/packages/web3/src/utils/exchange.ts b/packages/web3/src/utils/exchange.ts
index 58ccb4de3..d91859e63 100644
--- a/packages/web3/src/utils/exchange.ts
+++ b/packages/web3/src/utils/exchange.ts
@@ -16,9 +16,20 @@ You should have received a copy of the GNU Lesser General Public License
 along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
-import { AddressType, addressFromPublicKey, addressFromScript, binToHex, bs58, hexToBinUnsafe } from '..'
+import {
+  AddressType,
+  addressFromPublicKey,
+  addressFromScript,
+  binToHex,
+  bs58,
+  hexToBinUnsafe,
+  isHexString
+} from '../utils'
 import { Transaction } from '../api/api-alephium'
 import { Address } from '../signer'
+import { P2SH, unlockScriptCodec } from '../codec/unlock-script-codec'
+import { Buffer } from 'buffer/'
+import { scriptCodec } from '../codec/script-codec'
 
 export function validateExchangeAddress(address: string) {
   let decoded: Uint8Array
@@ -80,24 +91,35 @@ enum UnlockScriptType {
 }
 
 export function getAddressFromUnlockScript(unlockScript: string): Address {
+  if (!isHexString(unlockScript)) {
+    throw new Error(`Invalid unlock script ${unlockScript}, expected a hex string`)
+  }
   const decoded = hexToBinUnsafe(unlockScript)
   if (decoded.length === 0) throw new Error('UnlockScript is empty')
   const unlockScriptType = decoded[0]
   const unlockScriptBody = decoded.slice(1)
 
   if (unlockScriptType === UnlockScriptType.P2PKH) {
+    if (unlockScriptBody.length !== 33) {
+      throw new Error(`Invalid p2pkh unlock script: ${unlockScript}`)
+    }
     return addressFromPublicKey(binToHex(unlockScriptBody))
-  } else if (unlockScriptType === UnlockScriptType.P2MPKH) {
+  }
+
+  if (unlockScriptType === UnlockScriptType.P2MPKH) {
     throw new Error('Naive multi-sig address is not supported for exchanges as it will be replaced by P2SH')
-  } else if (unlockScriptType === UnlockScriptType.P2SH) {
-    // FIXEME: for now we assume that the params is empty, so we need to
-    // remove the last byte from the `unlockScriptBody`, we can decode
-    // the unlock script once the codec PR is merged
-    const script = unlockScriptBody.slice(0, -1)
-    return addressFromScript(script)
-  } else {
-    throw new Error('Invalid unlock script type')
   }
+
+  if (unlockScriptType === UnlockScriptType.P2SH) {
+    let p2sh: P2SH
+    try {
+      p2sh = unlockScriptCodec.decode(Buffer.from(decoded)).script as P2SH
+    } catch (_) {
+      throw new Error(`Invalid p2sh unlock script: ${unlockScript}`)
+    }
+    return addressFromScript(scriptCodec.encode(p2sh.script))
+  }
+  throw new Error('Invalid unlock script type')
 }
 
 function checkALPHOutput(tx: Transaction): boolean {
diff --git a/packages/web3/src/utils/number.ts b/packages/web3/src/utils/number.ts
index ae196c87a..6de41cf31 100644
--- a/packages/web3/src/utils/number.ts
+++ b/packages/web3/src/utils/number.ts
@@ -21,7 +21,7 @@ along with the library. If not, see <http://www.gnu.org/licenses/>.
 // 2. https://github.com/ethers-io/ethers.js/blob/724881f34d428406488a1c9f9dbebe54b6edecda/src.ts/utils/fixednumber.ts
 
 import BigNumber from 'bignumber.js'
-import { Number256 } from '..'
+import { Number256 } from '../api/types'
 
 export const isNumeric = (numToCheck: any): boolean => !isNaN(parseFloat(numToCheck)) && isFinite(numToCheck)
 
diff --git a/packages/web3/src/utils/sign.ts b/packages/web3/src/utils/sign.ts
index d1a979175..14706d6d6 100644
--- a/packages/web3/src/utils/sign.ts
+++ b/packages/web3/src/utils/sign.ts
@@ -17,7 +17,7 @@ along with the library. If not, see <http://www.gnu.org/licenses/>.
 */
 
 import { ec as EC } from 'elliptic'
-import { binToHex, encodeSignature, hexToBinUnsafe, signatureDecode } from '..'
+import { binToHex, encodeSignature, hexToBinUnsafe, signatureDecode } from '../utils'
 import { KeyType } from '../signer'
 import * as necc from '@noble/secp256k1'
 import { createHash, createHmac } from 'crypto'