Deployment Rollback Trigger

WHAT IT DOES Deployment Rollback Trigger is a read-only developer tool that analyzes the feasibility of rolling back a contract deployment to a previous block. It reads current and historical contract state (bytecode and balance), compares them to identify differences, and generates a detailed rollback readiness report. The tool validates the target block, checks if the contract existed at that block, detects code and balance changes, and provides a structured checklist with pass/fail/warn status for each rollback criterion. It helps developers plan for deployment recovery scenarios, understand the impact of a rollback, and make informed decisions about whether to revert a contract version. HOW TO USE Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed. Enter the contract address, the target block number to roll back to, and the contract name. Click "Simulate Rollback" to analyze the rollback feasibility. Results include an overall status (Rollback Feasible/Rollback May Be Complex), a state comparison showing code and balance changes, a checklist with target block validation, contract existence, code change detection, balance change detection, and rollback distance, a visual progress bar, and a detailed rollback plan with step-by-step instructions. The tool provides specific recommendations for addressing any failing or warning checks. All analysis is read-only—no signatures or transactions are submitted. TECHNICAL MECHANISM The tool uses ethers.js v5.7.2 to read chain state via the provider. It retrieves the current block number via provider.getBlockNumber() and validates the target block using provider.getBlock(targetBlock). Current state is fetched using provider.getCode(address) and provider.getBalance(address). Historical state is fetched using the same methods with the target block number as the second parameter. The tool performs five checks: (1) Target block exists—validates that the block number is available; (2) Contract existed at target—verifies that the address held bytecode at the target block; (3) Code change detection—compares current and historical bytecode; (4) Balance change detection—compares current and historical balances; (5) Rollback distance—checks the number of blocks between current and target (warns if >100,000 blocks). Each check returns a pass, warn, or fail status. The overall readiness score is calculated as the percentage of passed checks, with thresholds: ≥80% = Feasible,