Overview

This node operation retrieves the bytecode of a smart contract deployed on the blockchain using the Infura API. It is useful for developers or blockchain analysts who want to inspect the contract's code at a specific block. For example, it can be used to verify the contract's code at the latest block or at a historical block to analyze changes over time.

Use Case Examples

1. Retrieve the bytecode of a contract at the latest block to verify its current implementation.
2. Fetch the contract code at a specific block number to audit historical contract states.

Properties

Output

JSON

• contractAddress - The address of the contract queried.
• blockTag - The block identifier used for the request.
• code - The bytecode of the contract at the specified block.
• hasCode - Boolean indicating if the contract has bytecode (true if code is not '0x').
• metadata
  • network - The blockchain network used (from Infura credentials).
  • operation - The operation performed, here 'getCode'.
  • timestamp - Timestamp when the request was made.
  • infura_endpoint - The Infura API endpoint URL used for the request.
  • raw_response - The raw response data returned from the Infura API.

Dependencies

• Infura API credentials including network, project ID, and optionally project secret for authentication.

Troubleshooting

• Ensure the contract address is valid and correctly formatted as a hex string starting with '0x'.
• Verify that the block tag is valid; it should be 'latest', 'earliest', 'pending', or a valid hex block number.
• Check that the Infura API credentials are correctly set up and have the necessary permissions.
• If the response code is '0x', it means the contract has no bytecode at the specified block, which might indicate an incorrect address or block.

Links

• Infura eth_getCode Documentation - Official Infura documentation for the eth_getCode JSON-RPC method used to get contract bytecode.