diff --git a/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeImplementation.ts b/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeImplementation.ts
index 26262cbe264cb..b01e6f654c7fb 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeImplementation.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeImplementation.ts
@@ -1,14 +1,110 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
-import { ethers } from 'hardhat'
+import { HardhatRuntimeEnvironment } from 'hardhat/types'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
+import fetch from 'node-fetch'
+
+import {
+  isTargetL1Network,
+  predeploy,
+  getProxyAdmin,
+  validateERC721Bridge,
+} from '../../src/nft-bridge-deploy-helpers'
+
+// Handle the `ops` deployment
+const getL1CrossDomainMessengerProxyDeployment = async (
+  hre: HardhatRuntimeEnvironment
+) => {
+  const network = hre.network.name
+  if (network === 'ops-l1') {
+    const res = await fetch(
+      'http://localhost:8080/deployments/local/Proxy__OVM_L1CrossDomainMessenger.json'
+    )
+    return res.json()
+  } else {
+    return hre.deployments.get('Proxy__OVM_L1CrossDomainMessenger')
+  }
+}
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { deploy } = hre.deployments
+  const { getAddress } = hre.ethers.utils
+
+  if (!isTargetL1Network(hre.network.name)) {
+    console.log(`Deploying to unsupported network ${hre.network.name}`)
+    return
+  }
+
+  console.log(`Deploying L1ERC721Bridge to ${hre.network.name}`)
+  console.log(`Using deployer ${deployer}`)
+
+  const Deployment__L1ERC721BridgeProxy = await hre.deployments.get(
+    'L1ERC721BridgeProxy'
+  )
+
+  const L1ERC721BridgeProxy = await hre.ethers.getContractAt(
+    'Proxy',
+    Deployment__L1ERC721BridgeProxy.address
+  )
+
+  const admin = await L1ERC721BridgeProxy.callStatic.admin()
+  if (getAddress(admin) !== getAddress(deployer)) {
+    throw new Error('deployer is not proxy admin')
+  }
+
+  // Get the address of the currently deployed L1CrossDomainMessenger.
+  // This should be the address of the proxy
+  const Deployment__L1CrossDomainMessengerProxy =
+    await getL1CrossDomainMessengerProxyDeployment(hre)
 
-  await hre.deployments.deploy('L1ERC721Bridge', {
+  const L1CrossDomainMessengerProxyAddress =
+    Deployment__L1CrossDomainMessengerProxy.address
+
+  // Deploy the L1ERC721Bridge. The arguments are
+  // - messenger
+  // - otherBridge
+  // Since this is the L1ERC721Bridge, the otherBridge is the
+  // predeploy address
+  await deploy('L1ERC721Bridge', {
     from: deployer,
-    args: [ethers.constants.AddressZero, ethers.constants.AddressZero],
+    args: [L1CrossDomainMessengerProxyAddress, predeploy],
     log: true,
+    waitConfirmations: 1,
+  })
+
+  const Deployment__L1ERC721Bridge = await hre.deployments.get('L1ERC721Bridge')
+  console.log(
+    `L1ERC721Bridge deployed to ${Deployment__L1ERC721Bridge.address}`
+  )
+
+  await validateERC721Bridge(hre, Deployment__L1ERC721Bridge.address, {
+    messenger: L1CrossDomainMessengerProxyAddress,
+    otherBridge: predeploy,
+  })
+
+  {
+    // Upgrade the Proxy to the newly deployed implementation
+    const tx = await L1ERC721BridgeProxy.upgradeTo(
+      Deployment__L1ERC721Bridge.address
+    )
+    const receipt = await tx.wait()
+    console.log(`L1ERC721BridgeProxy upgraded: ${receipt.transactionHash}`)
+  }
+
+  {
+    // Set the admin correctly
+    const newAdmin = getProxyAdmin(hre.network.name)
+    const tx = await L1ERC721BridgeProxy.changeAdmin(newAdmin)
+    const receipt = await tx.wait()
+    console.log(`L1ERC721BridgeProxy admin updated: ${receipt.transactionHash}`)
+  }
+
+  await validateERC721Bridge(hre, L1ERC721BridgeProxy.address, {
+    messenger: L1CrossDomainMessengerProxyAddress,
+    otherBridge: predeploy,
   })
 }
 
diff --git a/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeProxy.ts b/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeProxy.ts
index bacbc940c0d50..68fd1f6a0c862 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeProxy.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/L1ERC721BridgeProxy.ts
@@ -1,24 +1,37 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
+
+import { isTargetL1Network } from '../../src/nft-bridge-deploy-helpers'
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { deploy } = hre.deployments
 
-  const { deploy } = await hre.deployments.deterministic(
-    'L1ERC721BridgeProxy',
-    {
-      contract: 'Proxy',
-      salt: hre.ethers.utils.solidityKeccak256(
-        ['string'],
-        ['L1ERC721BridgeProxy']
-      ),
-      from: deployer,
-      args: [hre.deployConfig.ddd],
-      log: true,
-    }
-  )
+  if (!isTargetL1Network(hre.network.name)) {
+    console.log(`Deploying to unsupported network ${hre.network.name}`)
+    return
+  }
+
+  console.log(`Deploying L1ERC721BridgeProxy to ${hre.network.name}`)
+  console.log(`Using deployer ${deployer}`)
 
-  await deploy()
+  await deploy('L1ERC721BridgeProxy', {
+    contract: 'Proxy',
+    from: deployer,
+    args: [deployer],
+    log: true,
+    waitConfirmations: 1,
+  })
+
+  const Deployment__L1ERC721BridgeProxy = await hre.deployments.get(
+    'L1ERC721BridgeProxy'
+  )
+  console.log(
+    `L1ERC721BridgeProxy deployed to ${Deployment__L1ERC721BridgeProxy.address}`
+  )
 }
 
 deployFn.tags = ['L1ERC721BridgeProxy']
diff --git a/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeImplementation.ts b/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeImplementation.ts
index f353b3ba24bc6..e5bc678492be3 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeImplementation.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeImplementation.ts
@@ -1,18 +1,95 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
-import { ethers } from 'hardhat'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
+import { predeploys } from '@eth-optimism/contracts'
+
+import {
+  isTargetL2Network,
+  predeploy,
+  validateERC721Bridge,
+  getProxyAdmin,
+} from '../../src/nft-bridge-deploy-helpers'
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { getAddress } = hre.ethers.utils
+
+  if (!isTargetL2Network(hre.network.name)) {
+    console.log(`Deploying to unsupported network ${hre.network.name}`)
+    return
+  }
+
+  console.log(`Deploying L2ERC721Bridge to ${hre.network.name}`)
+  console.log(`Using deployer ${deployer}`)
+
+  const L2ERC721BridgeProxy = await hre.ethers.getContractAt('Proxy', predeploy)
+
+  // Check to make sure that the admin of the proxy is the deployer.
+  // The deployer of the L2ERC721Bridge should be the same as the
+  // admin of the L2ERC721BridgeProxy so that it is easy to upgrade
+  // the implementation. The admin is then changed depending on the
+  // network after the L2ERC721BridgeProxy is upgraded to the implementation
+  const admin = await L2ERC721BridgeProxy.callStatic.admin()
+
+  if (getAddress(admin) !== getAddress(deployer)) {
+    throw new Error(`Unexpected admin ${admin}`)
+  }
+
+  const Deployment__L1ERC721Bridge = await hre.deployments.get(
+    'L1ERC721BridgeProxy'
+  )
+
+  const L1ERC721BridgeAddress = Deployment__L1ERC721Bridge.address
 
+  // Deploy the L2ERC721Bridge implementation
   await hre.deployments.deploy('L2ERC721Bridge', {
     from: deployer,
-    args: [ethers.constants.AddressZero, ethers.constants.AddressZero],
+    args: [predeploys.L2CrossDomainMessenger, L1ERC721BridgeAddress],
     log: true,
+    waitConfirmations: 1,
   })
+
+  const Deployment__L2ERC721Bridge = await hre.deployments.get('L2ERC721Bridge')
+  console.log(
+    `L2ERC721Bridge deployed to ${Deployment__L2ERC721Bridge.address}`
+  )
+
+  await validateERC721Bridge(hre, Deployment__L2ERC721Bridge.address, {
+    messenger: predeploys.L2CrossDomainMessenger,
+    otherBridge: L1ERC721BridgeAddress,
+  })
+
+  {
+    // Upgrade the implementation of the proxy to the newly deployed
+    // L2ERC721Bridge
+    const tx = await L2ERC721BridgeProxy.upgradeTo(
+      Deployment__L2ERC721Bridge.address
+    )
+    const receipt = await tx.wait()
+    console.log(
+      `Upgraded the implementation of the L2ERC721BridgeProxy: ${receipt.transactionhash}`
+    )
+  }
+
+  await validateERC721Bridge(hre, L2ERC721BridgeProxy.address, {
+    messenger: predeploys.L2CrossDomainMessenger,
+    otherBridge: L1ERC721BridgeAddress,
+  })
+
+  {
+    const newAdmin = getProxyAdmin(hre.network.name)
+    console.log(`Changing admin to ${newAdmin}`)
+    const tx = await L2ERC721BridgeProxy.changeAdmin(newAdmin)
+    const receipt = await tx.wait()
+    console.log(
+      `Changed admin of the L2ERC721BridgeProxy: ${receipt.transactionHash}`
+    )
+  }
 }
 
 deployFn.tags = ['L2ERC721BridgeImplementation']
-deployFn.dependencies = ['L2ERC721BridgeProxy']
+deployFn.dependencies = ['L2ERC721BridgeProxy', 'L1ERC721BridgeProxy']
 
 export default deployFn
diff --git a/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeProxy.ts b/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeProxy.ts
index d9c5c9eedb532..1f494b099d654 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeProxy.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/L2ERC721BridgeProxy.ts
@@ -1,24 +1,68 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
+
+const predeploy = '0x4200000000000000000000000000000000000014'
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { getAddress } = hre.ethers.utils
 
-  const { deploy } = await hre.deployments.deterministic(
-    'L2ERC721BridgeProxy',
-    {
-      contract: 'Proxy',
-      salt: hre.ethers.utils.solidityKeccak256(
-        ['string'],
-        ['L2ERC721BridgeProxy']
-      ),
-      from: deployer,
-      args: [hre.deployConfig.ddd],
-      log: true,
-    }
+  console.log(`Deploying L2ERC721BridgeProxy to ${hre.network.name}`)
+  console.log(`Using deployer ${deployer}`)
+
+  // Check to make sure that the Proxy has not been deployed yet
+  const pre = await hre.ethers.provider.getCode(predeploy, 'latest')
+  if (pre !== '0x') {
+    console.log(`Code already deployed to ${predeploy}`)
+    return
+  }
+
+  // A special deployer account must be used
+  const mainnetDeployer = getAddress(
+    '0x53A6eecC2dD4795Fcc68940ddc6B4d53Bd88Bd9E'
+  )
+  const goerliDeployer = getAddress(
+    '0x5c679a57e018f5f146838138d3e032ef4913d551'
   )
+  const localDeployer = getAddress('0xdfc82d475833a50de90c642770f34a9db7deb725')
+
+  // Deploy the L2ERC721BridgeProxy as a predeploy address
+  if (hre.network.name === 'optimism') {
+    if (getAddress(deployer) !== mainnetDeployer) {
+      throw new Error(`Incorrect deployer: ${deployer}`)
+    }
+  } else if (hre.network.name === 'optimism-goerli') {
+    if (getAddress(deployer) !== goerliDeployer) {
+      throw new Error(`Incorrect deployer: ${deployer}`)
+    }
+  } else if (hre.network.name === 'ops-l2') {
+    if (getAddress(deployer) !== localDeployer) {
+      throw new Error(`Incorrect deployer: ${deployer}`)
+    }
+  } else {
+    throw new Error(`Unknown network: ${hre.network.name}`)
+  }
+
+  // Set the deployer as the admin of the Proxy. This is
+  // temporary, the admin will be updated when deploying
+  // the implementation
+  await hre.deployments.deploy('L2ERC721BridgeProxy', {
+    contract: 'Proxy',
+    from: deployer,
+    args: [deployer],
+    log: true,
+    waitConfirmations: 1,
+  })
 
-  await deploy()
+  // Check that the Proxy was deployed to the correct address
+  const code = await hre.ethers.provider.getCode(predeploy)
+  if (code === '0x') {
+    throw new Error('Code is not set at expected predeploy address')
+  }
+  console.log(`L2ERC721BridgeProxy deployed to ${predeploy}`)
 }
 
 deployFn.tags = ['L2ERC721BridgeProxy']
diff --git a/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryImplementation.ts b/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryImplementation.ts
index 03c5cf78cde49..cc57d3229f75f 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryImplementation.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryImplementation.ts
@@ -1,15 +1,82 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
-import { ethers } from 'hardhat'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
+
+import { getProxyAdmin, predeploy } from '../../src/nft-bridge-deploy-helpers'
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { getAddress } = hre.ethers.utils
+
+  console.log(`Deploying OptimismMintableERC721Factory to ${hre.network.name}`)
+  console.log(`Using deployer ${deployer}`)
+
+  const Deployment__OptimismMintableERC721FactoryProxy =
+    await hre.deployments.get('OptimismMintableERC721FactoryProxy')
+
+  const OptimismMintableERC721FactoryProxy = await hre.ethers.getContractAt(
+    'Proxy',
+    Deployment__OptimismMintableERC721FactoryProxy.address
+  )
+
+  // Check that the admin of the OptimismMintableERC721FactoryProxy is the
+  // deployer. This makes it easy to upgrade the implementation of the proxy
+  // and then transfer the admin privilege after deploying the implementation
+  const admin = await OptimismMintableERC721FactoryProxy.callStatic.admin()
+  if (getAddress(admin) !== getAddress(deployer)) {
+    throw new Error('deployer is not proxy admin')
+  }
+
+  let remoteChainId: number
+  if (hre.network.name === 'optimism') {
+    remoteChainId = 1
+  } else if (hre.network.name === 'optimism-goerli') {
+    remoteChainId = 5
+  } else if (hre.network.name === 'ops-l2') {
+    remoteChainId = 31337
+  } else {
+    remoteChainId = hre.deployConfig.remoteChainId
+  }
+
+  if (typeof remoteChainId !== 'number') {
+    throw new Error('remoteChainId not defined')
+  }
 
   await hre.deployments.deploy('OptimismMintableERC721Factory', {
     from: deployer,
-    args: [ethers.constants.AddressZero, 0],
+    args: [predeploy, remoteChainId],
     log: true,
+    waitConfirmations: 1,
   })
+
+  const Deployment__OptimismMintableERC721Factory = await hre.deployments.get(
+    'OptimismMintableERC721Factory'
+  )
+  console.log(
+    `OptimismMintableERC721Factory deployed to ${Deployment__OptimismMintableERC721Factory.address}`
+  )
+
+  {
+    // Upgrade the Proxy to the newly deployed implementation
+    const tx = await OptimismMintableERC721FactoryProxy.upgradeTo(
+      Deployment__OptimismMintableERC721Factory.address
+    )
+    const receipt = await tx.wait()
+    console.log(
+      `OptimismMintableERC721FactoryProxy upgraded: ${receipt.transactionHash}`
+    )
+  }
+
+  {
+    const newAdmin = getProxyAdmin(hre.network.name)
+    const tx = await OptimismMintableERC721FactoryProxy.changeAdmin(newAdmin)
+    const receipt = await tx.wait()
+    console.log(
+      `OptimismMintableERC721FactoryProxy admin updated: ${receipt.transactionHash}`
+    )
+  }
 }
 
 deployFn.tags = ['OptimismMintableERC721FactoryImplementation']
diff --git a/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryProxy.ts b/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryProxy.ts
index 89c8b257c2c7f..9d33385abe819 100644
--- a/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryProxy.ts
+++ b/packages/contracts-periphery/deploy/nft-bridge/OptimismMintableERC721FactoryProxy.ts
@@ -1,24 +1,34 @@
 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
+import '@eth-optimism/hardhat-deploy-config'
+import '@nomiclabs/hardhat-ethers'
+import 'hardhat-deploy'
 
 const deployFn: DeployFunction = async (hre) => {
   const { deployer } = await hre.getNamedAccounts()
+  const { deploy } = hre.deployments
 
-  const { deploy } = await hre.deployments.deterministic(
-    'OptimismMintableERC721FactoryProxy',
-    {
-      contract: 'Proxy',
-      salt: hre.ethers.utils.solidityKeccak256(
-        ['string'],
-        ['OptimismMintableERC721FactoryProxy']
-      ),
-      from: deployer,
-      args: [hre.deployConfig.ddd],
-      log: true,
-    }
+  console.log(
+    `Deploying OptimismMintableERC721FactoryProxy to ${hre.network.name}`
   )
+  console.log(`Using deployer ${deployer}`)
 
-  await deploy()
+  // Deploy the OptimismMintableERC721FactoryProxy with
+  // the deployer as the admin. The admin and implementation
+  // will be updated with the deployment of the implementation
+  await deploy('OptimismMintableERC721FactoryProxy', {
+    contract: 'Proxy',
+    from: deployer,
+    args: [deployer],
+    log: true,
+    waitConfirmations: 1,
+  })
+
+  const Deployment__OptimismMintableERC721FactoryProxy =
+    await hre.deployments.get('OptimismMintableERC721FactoryProxy')
+  console.log(
+    `OptimismMintableERC721FactoryProxy deployed to ${Deployment__OptimismMintableERC721FactoryProxy.address}`
+  )
 }
 
 deployFn.tags = ['OptimismMintableERC721FactoryProxy']
diff --git a/packages/contracts-periphery/hardhat.config.ts b/packages/contracts-periphery/hardhat.config.ts
index b5e41df964b5c..856d6b28e08c4 100644
--- a/packages/contracts-periphery/hardhat.config.ts
+++ b/packages/contracts-periphery/hardhat.config.ts
@@ -112,6 +112,21 @@ const config: HardhatUserConfig = {
         },
       },
     },
+    'ops-l2': {
+      chainId: 17,
+      accounts: [
+        '0x3b8d2345102cce2443acb240db6e87c8edd4bb3f821b17fab8ea2c9da08ea132',
+        '0xa6aecc98b63bafb0de3b29ae9964b14acb4086057808be29f90150214ebd4a0f',
+      ],
+      url: 'http://127.0.0.1:8545',
+    },
+    'ops-l1': {
+      chainId: 31337,
+      accounts: [
+        '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80',
+      ],
+      url: 'http://127.0.0.1:9545',
+    },
   },
   paths: {
     deployConfig: './config/deploy',
diff --git a/packages/contracts-periphery/scripts/deploy-nft-bridge.sh b/packages/contracts-periphery/scripts/deploy-nft-bridge.sh
new file mode 100755
index 0000000000000..7153e853a2350
--- /dev/null
+++ b/packages/contracts-periphery/scripts/deploy-nft-bridge.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -e
+
+L1_NETWORK=ops-l1
+L2_NETWORK=ops-l2
+
+# Step 1: deploy the Proxy to the predeploy address on L2
+npx hardhat deploy --tags L2ERC721BridgeProxy --network $L2_NETWORK
+
+# Step 2: deploy the Proxy for the L1ERC721Bridge to L1
+npx hardhat deploy --tags L1ERC721BridgeProxy --network $L1_NETWORK
+
+# Step 3: deploy the L2ERC721Bridge implementation
+npx hardhat deploy --tags L2ERC721BridgeImplementation --network $L2_NETWORK
+
+# Step 4: deploy the L1ERC721Bridge implementation to L1
+npx hardhat deploy --tags L1ERC721BridgeImplementation --network $L1_NETWORK
+
+# Step 5: deploy the Proxy for the OptimismMintableERC721Factory to L2
+npx hardhat deploy --tags OptimismMintableERC721FactoryProxy --network $L2_NETWORK
+
+# Step 5: deploy the OptimismMintableERC721Factory to L2
+npx hardhat deploy --tags OptimismMintableERC721FactoryImplementation --network $L2_NETWORK
diff --git a/packages/contracts-periphery/src/nft-bridge-deploy-helpers.ts b/packages/contracts-periphery/src/nft-bridge-deploy-helpers.ts
new file mode 100644
index 0000000000000..84af7642cb475
--- /dev/null
+++ b/packages/contracts-periphery/src/nft-bridge-deploy-helpers.ts
@@ -0,0 +1,66 @@
+import { utils } from 'ethers'
+
+// https://optimistic.etherscan.io/address/0x2501c477d0a35545a387aa4a3eee4292a9a8b3f0
+export const l2MainnetMultisig = '0x2501c477D0A35545a387Aa4A3EEe4292A9a8B3F0'
+// https://etherscan.io/address/0x9BA6e03D8B90dE867373Db8cF1A58d2F7F006b3A
+export const l1MainnetMultisig = '0x9BA6e03D8B90dE867373Db8cF1A58d2F7F006b3A'
+// https://goerli.etherscan.io/address/0xf80267194936da1E98dB10bcE06F3147D580a62e
+export const goerliAdmin = '0xf80267194936da1E98dB10bcE06F3147D580a62e'
+export const predeploy = '0x4200000000000000000000000000000000000014'
+export const predeployDeployer = '0xdfc82d475833a50de90c642770f34a9db7deb725'
+
+export const isTargetL2Network = (network: string): boolean => {
+  switch (network) {
+    case 'optimism':
+    case 'optimism-goerli':
+    case 'ops-l2':
+      return true
+    default:
+      return false
+  }
+}
+
+export const isTargetL1Network = (network: string): boolean => {
+  switch (network) {
+    case 'mainnet':
+    case 'goerli':
+    case 'ops-l1':
+      return true
+    default:
+      return false
+  }
+}
+
+export const getProxyAdmin = (network: string): string => {
+  switch (network) {
+    case 'optimism':
+      return l2MainnetMultisig
+    case 'mainnet':
+      return l1MainnetMultisig
+    case 'goerli':
+    case 'optimism-goerli':
+      return goerliAdmin
+    case 'ops-l1':
+    case 'ops-l2':
+      return predeployDeployer
+    default:
+      throw new Error(`unknown network ${network}`)
+  }
+}
+
+export const validateERC721Bridge = async (hre, address: string, expected) => {
+  const L1ERC721Bridge = await hre.ethers.getContractAt('ERC721Bridge', address)
+
+  const messenger = await L1ERC721Bridge.messenger()
+  const otherBridge = await L1ERC721Bridge.otherBridge()
+
+  if (utils.getAddress(messenger) !== utils.getAddress(expected.messenger)) {
+    throw new Error(`messenger mismatch`)
+  }
+
+  if (
+    utils.getAddress(otherBridge) !== utils.getAddress(expected.otherBridge)
+  ) {
+    throw new Error(`otherBridge mismatch`)
+  }
+}