# Error in signature check wallet
**URL:** https://collective.flashbots.net/t/error-in-signature-check-wallet/2646
**Category:** Searchers
**Tags:** question
**Created:** [November 15, 2023, 6:24pm UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646 "2023-11-15T18:24:32Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@cguth](https://collective.flashbots.net/u/cguth)
#### Post date: [November 15, 2023, 6:24pm UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/1 "2023-11-15T18:24:32Z")
Hello Flashbots community. Im trying to send my first bundle to flashbots relay. Im getting this error message here when trying to send it.
> error in signature check (my wallet address)
I guess something is wrong with how Ive set up the signature. I would appreciate any help! Here is my code
> async function sendAsyncTransaction() {
> try {
> const pending = await provider.getTransactionCount(signer.address, “pending”);
>
> ```
> const exampleTx = {
> to: "0x0C7172c8c5C000F39E2A11b04c52805aF29d945b",
> value: 1,
> gasLimit: "21000",
> maxFeePerGas: 50000000000,
> nonce: pending,
> type: 2,
> chainId: 1,
> };
>
> // sign tx
> const txs = await signer.signTransaction(exampleTx);
>
> // get current block
> const blockNumber = '0x' + (await provider.getBlockNumber() + 1).toString(16);
>
> const data = {
> jsonrpc: '2.0',
> id: '1',
> method: 'eth_sendBundle',
> params: [{txs, blockNumber}],
> };
>
> const signature = signer.address + ":" + await signer.signMessage(utils.id(data));
>
> const config = {
> headers: {
> 'Content-Type': 'application/json',
> 'X-Flashbots-Signature': `${signature}`, // Add your Flashbots signature here
> },
> };
>
> axios.post('https://relay.flashbots.net', data, config)
> .then((response: { data: any; }) => {
> console.log(response.data);
> })
> .catch((error: any) => {
> console.error(error);
> });
>
> } catch (error) {
> console.error(error);
> }
>
> ```
>
> }
Thanks in advance!
---
### Author:  [@cguth](https://collective.flashbots.net/u/cguth)
#### Post date: [November 18, 2023, 11:02am UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/2 "2023-11-18T11:02:06Z")
Issue solved!
---
### Author:  [@Fred](https://collective.flashbots.net/u/Fred)
#### Post date: [November 22, 2023, 9:28pm UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/3 "2023-11-22T21:28:58Z")
How did you solve it?🙂
---
### Author:  [@MEVC](https://collective.flashbots.net/u/MEVC)
#### Post date: [December 4, 2023, 6:52pm UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/4 "2023-12-04T18:52:54Z")
Hi @cguth, would you mind to share how you solved it? I am also having the same issue. Thanks!
---
### Author:  [@matrix](https://collective.flashbots.net/u/matrix)
#### Post date: [December 19, 2023, 5:05pm UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/5 "2023-12-19T17:05:10Z")
Hey @cguth, Please share the solution. I have been trying this for a long time. Not getting the fix. Please
Thanks in Advance
---
### Author:  [@matrix](https://collective.flashbots.net/u/matrix)
#### Post date: [December 20, 2023, 6:56am UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/6 "2023-12-20T06:56:21Z")
Hey, I got fix for it!!
Below is my script:
```js
const api_url = 'https://relay.flashbots.net'
const hexBlockNumberToSend = '0x' + targetBlock.toString(16);
const requestData = {
jsonrpc: '2.0',
id: 1,
method: 'eth_sendBundle',
params: [{
txs: transactions,
blockNumber: hexBlockNumberToSend,
}]
};
const provider = new ethers.providers.JsonRpcProvider(RPC_URL);
const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
const bodyText = JSON.stringify(requestData);
const messageSignature = await wallet.signMessage(ethers.utils.id(bodyText));
const signature = `${wallet.address}:${messageSignature}`;
try {
const response = await axios.post(api_url, requestData, {
headers: {
'Content-Type': 'application/json',
'X-Flashbots-Signature': `${signature}`, // Add your Flashbots signature here
},
});
```
---
### Author:  [@aman9723](https://collective.flashbots.net/u/aman9723)
#### Post date: [April 3, 2024, 5:00am UTC](https://collective.flashbots.net/t/error-in-signature-check-wallet/2646/7 "2024-04-03T05:00:11Z")
Getting incorrect request error. Please help.
```auto
let resolvePromise: (value: SnipeResponse) => void, rejectPromise: (reason?: any) => void
const promise = new Promise(async (resolve, reject) => {
resolvePromise = resolve
rejectPromise = reject
})
const builders = ['flashbots', 'f1b.io', 'rsync', 'beaverbuild.org', 'builder0x69', 'Titan', 'EigenPhi', 'boba-builder', 'Gambit Labs', 'payload', 'Loki', 'BuildAI', 'JetBuilder', 'tbuilder', 'penguinbuild', 'bobthebuilder']
const wallet = new Wallet(buyWalletPrivateKey[0], this.provider)
const router = new Contract(this.ROUTER_ADDRESS, routerAbi, wallet)
const txRequest = await router.swapETHForExactTokens.populateTransaction(amountOut, [this.WETH, tokenAddress], wallet.address, Date.now() + 1000 * 60 * 10, ethToCoinBase, {
value: amountInMax[0] + ethToCoinBase,
maxPriorityFeePerGas: parseUnits(extraPriorityFee, 'gwei'),
maxFeePerGas: parseUnits('100', 'gwei'),
})
const tx = await wallet.signTransaction(txRequest)
// send request on event
this.provider.once('block', async blockNumber => {
try {
console.log('New block:', blockNumber)
const maxBlockNumber = '0x' + (blockNumber + 2).toString(16)
const requestData = {
jsonrpc: '2.0',
id: 1,
method: 'eth_sendPrivateTransaction',
params: [
{
tx: tx,
maxBlockNumber: maxBlockNumber,
preferences: {
fast: true,
privacy: {
hints: ['transaction_hash'],
builders: builders,
},
validity: {
refund: [{ address: wallet.address, percent: 0 }],
},
},
},
],
}
const bodyText = JSON.stringify(requestData)
const messageSignature = await wallet.signMessage(id(bodyText))
const signature = `${wallet.address}:${messageSignature}`
const response = await axios.post(this.RELAY, requestData, {
headers: {
'Content-Type': 'application/json',
'X-Flashbots-Signature': `${signature}`, // Add your Flashbots signature here
},
})
resolvePromise({ message: 'Transaction sent', data: response.data })
} catch (error) {
console.log((error as any).message)
rejectPromise(error)
}
})
return promise
```