Event Log Decoder
Blockchain Event Analysis Tool
Decode blockchain event logs from transaction receipts. Support for Ethereum, BSC, Polygon, and more. Analyze events by transaction hash or decode raw log data manually.
Input
What are Event Logs?
Event logs are records emitted by smart contracts during execution. They provide a way to track contract activity, such as transfers, approvals, and state changes. Logs are stored on the blockchain and can be queried efficiently.
Indexed Parameters
Events can have up to 3 indexed parameters, which are stored in the log topics for efficient filtering. Indexed parameters are hashed (except for value types like addresses and numbers), allowing quick searches without decoding.
Decoding Process
Decoding requires the contract ABI to map log topics and data back to readable parameters. The first topic is always the event signature hash. Additional topics are indexed parameters, and the data field contains non-indexed parameters.