Understanding the Process
To retrieve all tokens and associated addresses from an Ethereum (ETH) wallet, follow this systematic approach:
Step 1: Fetch Transaction History
- Obtain the complete transaction record of Wallet W.
Step 2: Compile Addresses
- Extract all
fromandtoaddresses from transactions and store them in Array A.
Step 3: Decode Transaction Inputs
- Remove the first 8 characters (method name) from the
inputfield per ABI rules. - Split the remaining string into 64-character segments to derive parameter lists.
- Identify right-aligned parameters matching ETH address length (42 characters including
0x) and add them to Array A.
Step 4: Identify Valid Tokens
For each address in Array A:
- Call ERC20 standard methods
symbol()anddecimals(). - If both exist, confirm as a token and add to Array B.
- Call ERC20 standard methods
Step 5: Retrieve Token Balances
For each token in Array B:
- Invoke
balanceOf()to get the token balance for Wallet W. - Store results in Array C.
- Invoke
Step 6: Final Output
- Arrays B and C now contain all tokens held by Wallet W and their respective balances.
Key Considerations
- Smart Contract Interactions: Some addresses may represent contracts rather than tokens—verify using ERC20 methods.
- Gas Efficiency: Batch requests via multicall contracts to reduce gas costs during steps 4–5.
- Privacy: Public blockchains expose transaction details; wallet anonymity relies on address separation.
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Frequently Asked Questions
How can I verify if an address is an ERC20 token?
Call the symbol() and decimals() methods. Successful responses indicate ERC20 compliance.
Why do some transactions lack token transfer data?
Non-token transactions (e.g., ETH transfers or contract calls) won’t populate token-related arrays.
Can I automate this process?
Yes—use libraries like Web3.js or Ethers.js to script the queries and handle responses programmatically.
What’s the most gas-intensive step?
Balance checks (balanceOf) for multiple tokens incur higher gas fees. Optimize by checking only active tokens.
How often should I update token balances?
Balances change with transactions. For real-time accuracy, query balances before critical operations.