Transparent Proxy Pattern Migrator

WHAT IT DOES

Transparent Proxy Pattern Migrator is a specialized developer tool that upgrades EIP-1967 transparent proxy contracts to new implementations. It reads the current proxy admin address and implementation address directly from the EIP-1967 standard storage slots using eth_getStorageAt, ensuring accurate detection of the proxy's current state. The tool retrieves the proxy's bytecode via eth_getCode to verify it follows the transparent proxy pattern and confirms the proxy is properly deployed. It also reads chain state to determine the current block number for transaction context. Once the proxy state is verified, the tool builds and signs upgrade transactions using the admin account, calling the proxy's upgradeTo or upgrade function to point the proxy to a new implementation contract. Optionally, it can also transfer admin ownership to a new address via changeAdmin. All operations are executed with gas estimation based on the current wallet balance and network conditions.

HOW TO USE

Connect your wallet to the target EVM chain. Enter the proxy contract address, the new implementation address, and optionally a new admin address (leave blank to keep the current admin). Click "Read proxy state" to fetch and verify the current proxy configuration. The tool will display the current admin, current implementation, and validate that the proxy follows the EIP-1967 transparent proxy pattern. Review the migration details carefully. If all checks pass, click "Sign & migrate proxy" to submit the upgrade transaction. The tool will send the transaction, wait for confirmation, and optionally update the admin if a new address was provided. A confirmation message will display the transaction hash and block number upon completion.

TECHNICAL NOTE: STORAGE SLOT VERIFICATION AND TRANSACTION BUILDING

The tool reads the admin slot (0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103) and implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc) to determine the current proxy state. It then performs bytecode verification to confirm the proxy uses the transparent pattern by checking for minimal fallback code and the absence of self-destruct or delegatecall self-destruct patterns. The tool dynamically detects which upgrade function the proxy exposes (upgradeTo, upgrade, or a custom admin function) by attempting to build the call with the minimal ABI. If the proxy uses a non-standard upgrade function, the tool gracefully handles fallback attempts. For admin changes, the tool uses the standard changeAdmin function. All transactions are signed by the wallet's connected admin account, and the tool pre-estimates gas to ensure sufficient balance before sending. After the transaction is mined, the tool re-reads the proxy state to confirm the implementation has been updated and displays the new values.

WHAT IT CANNOT SEE

The tool cannot migrate proxies that use non-standard storage slots or custom proxy patterns that deviate from EIP-1967, including proxies that store admin or implementation in arbitrary locations. It cannot verify that the new implementation's storage layout is fully compatible with the current proxy's state variables, meaning upgrades that introduce storage collisions or shift existing variables will still execute. It cannot detect logical errors in the new implementation, such as broken initialization, failed reinitializer protection, or missing function selectors that would render the proxy unusable. It cannot handle proxies with multiple admins, timelock controllers, or multi-signature admin schemes. The tool cannot migrate proxies on non-EVM chains. It cannot simulate the full runtime impact of the migration before execution, including interactions with other contracts that depend on the proxy's ABI. It cannot revert incomplete migrations or roll back to a previous implementation after the transaction is confirmed.

PLEASE NOTE

This tool is designed exclusively for EVM-compatible chains (Ethereum, Polygon, BSC, Arbitrum, Optimism, Avalanche C-Chain, etc.). It does not support non-EVM blockchains like Bitcoin, Solana, Cosmos, or Tron. The tool requires the connected wallet to be the current admin of the proxy contract. Only the admin can perform upgrades. Ensure the new implementation contract is deployed and verified before attempting migration. The upgrade transaction is final and cannot be undone without another upgrade transaction. Always test migrations on a testnet before executing on mainnet. Gas costs vary by network and transaction complexity.