Understand Metamk’s balance updates
In this article, we will deepen how Metamk, a popular Ethereum and Builder DAPP wallet, monitor the updated balances of their ERC20 tokens (Ethereum headquarters in Ethereum).
The magic of equilibrium updates in MetamSk
When you create an account on a blockchain platform such as Metamask or Truffle Suite, it is essentially being recorded for a user interface that interacts with several intelligent contracts, including those that manage its digital assets. One of these contracts is the ERC20 standard, which allows developers to create tokens -based applications.
The background process: balances
When an ERC20 transfer occurs, it is not just a simple « move from one wallet to another. » Instead, it implies updating the balance of both parties involved in the transaction. In Metamask, this process is handled by means of a background thread that runs periodically on its device.
This is what happens:
- Event listeners : When an ERC20 transfer occurs, you will receive Metamask notifications through events listeners (for example, `
eventontransfer). These event listeners are attached to the smart contract that manages their tokens.
- Balance update : When the listener of the event detects a new transfer, it triggers an update of the balance of both parties involved in the transaction. This is done by consulting the internal state of the contract and updating the 'Totalsupply' property accordingly.
- Update in the background subprocess : The updated value is sent to the metamask background thread using the websocks or IPC mechanisms (communication between processes).
Who calls Balancef ()
To understand what happens behind the scene, we must look at another crucial function:Balance of (). This method is called by the smart contract on behalf of your wallet when you consult your balance:
* Balance updates : When he callsbalance of () of MetamSk, triggers a request to the internal state of the contract. The contract responds to the current balance value.
* Websockts or IPC : If you are using websocks or IPC (for example, web3.js), you will send a request to the end point of the contract and receive the response immediately.
In summary
Metamask monitor its token erc20 balances by:
- Execution of periodic subprocesses that update the equilibrium values for each token transferred.
- Attach the listeners of events for intelligent contracts that manage their tokens, which activate the updates when an event occurs (for example, `
ontransfer`).
- Use of websockts or CPI mechanisms to send Metamk requests to the internal state of the contract and receive answers.
By understanding how balances are updated in Metamk, you can better appreciate the complexity of managing their digital assets on a blockchain platform like Ethereum.
