Metamask: How to check if a token is already added in Metamask?
Metamaska: Verification if the marker is already attached to Metamk
As a cryptocurrency user, you probably know the importance of safe and decentralized for a portfolio. Such a portfolio is Metamk, which allows users to store, manage and spend their cryptocurrencies in several blockchain. However, a widespread problem that users can cause flaws is when they try to add a new marker to their Metamk collection, but discovers it is already in use.
In this article, we will look at how to check that the marker is already attached to Metamk using the Web API. We will also explain why this problem arises and possible solutions to avoid it in the future.
Why not support the test of existing tokens?
Before diving into a solution, let’s check why Metamk does not support direct verification if the marker is already attached or registered. The main reason is that Metamk is above Ethereum, which has its own set of rules and rules for the management of tokens.
The Ethereum marker standard (ERC-721) requires the tokens to be unique in the blockchain, which means that they cannot be duplicated or reused. This means that even if the user was able to add several cases of the same token to his Metamask collection, that does not mean that everyone is part of the same purse.
How to check that the marker is already attached to Metamask via web API
Unfortunately, there is no formal way to check that Metamask has already been added to a specific marker using the Web API. However, to achieve this goal, we can use creative bypass solutions.
Here is an example of how you can introduce a bypass:
1
Get all Metamk saved tokens list
: You can use the «Eth_GetACTSCTS» method with the withdrawal feature to obtain a list of Metamk saved accounts. Then browse each account and check that any of its portfolios have a case of a marker that interests you.
- Check the presence of tokens in a particular portfolio : If you know who your wallet has the desired marker (for example, looking for it on a certain address), you can use the «Eth_Gettransaction» method to get a list of all this portfolio list. Then browse each transaction and check that any of them contains a marker.
Here is an example of JavaScript code to show it:
`JavaScript
Hastoken Asynchronous Function (Tokenname) {
// Get all the list of Metamk -stored tokens
Constands = Expect the window.ethetheum.getaccouts ();
for (permanent accounts) {
// check for any of the portfolios to have a marker
For (Const Txid of Wait Window.ethereum.GettransactionRecipts (Account) .MAP (tx.transactionhash) {
try {
// Get the transaction information
Const TX = waiting window.ethetheum.gettransaction (transactionid);
// check the case of a marker in the transaction
if.data ['markers'] && tx.data ['tokens'] [tokenname]) {
True return;
}
} Catch (error) {
Console.Error (error);
}
}
}
Returns false;
}
// Example of use:
Const tokenname = 'mytoken'; // replaced by the desired marker name
Hastoken (Tokenname) .then (Hastoken => {
IF (Hastoken) {
Console.log (Token $ {tokenname} has already been added to your metamk.») Portfolio;
} else {
Console.log (You have no marker $ {tokenname} .);
}
});
« ‘
Conclusion
While there is no direct way to check that the marker has already been added to Metamka using the Web API, you can use the bypass solutions as the above example to achieve this goal.
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