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# Passkeys & Other Keys

## Overview

A native multisig can combine secp256k1, P256, WebAuthn, and WebCrypto P256 owners. Each owner
signs with its own account implementation, and the multisig envelope combines the approvals.

## Recipes

These recipes assume you have [set up a Tempo client](/tempo).

### Combine Owner Key Types

:::code-group
```ts twoslash [example.ts]
import { Account, P256, WebAuthnP256, WebCryptoP256 } from 'viem/tempo'
import {
  prepareTransactionRequest,
  sendTransaction,
  signTransaction,
} from 'viem/actions'
import { client } from './viem.config'

const owners = [
  Account.fromSecp256k1(
    '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80'
  ),
  Account.fromP256(P256.randomPrivateKey()),
  Account.fromWebAuthnP256(
    await WebAuthnP256.createCredential({ name: 'Multisig owner' })
  ),
  Account.fromWebCryptoP256(await WebCryptoP256.createKeyPair()),
]

const account = Account.fromMultisig({
  owners: owners.map((owner) => owner.address),
  threshold: owners.length,
})
const request = await prepareTransactionRequest(client, {
  account,
  calls: [
    { to: '0xcafebabecafebabecafebabecafebabecafebabe', value: 1n },
  ],
})

const signatures = await Promise.all(
  owners.map((owner) =>
    signTransaction(client, { ...request, account: owner })
  )
)
const hash = await sendTransaction(client, { ...request, signatures })
```

```ts twoslash [viem.config.ts] filename="viem.config.ts"
// [!include ~/snippets/tempo/viem.config.ts:setup]
```
:::

## Best Practices

### Expect Passkey Prompts

[`Account.fromWebAuthnP256`](/tempo/accounts/account.fromWebAuthnP256) creates the passkey owner
from a WebAuthn credential. The passkey prompts for approval when it signs the transaction.

### Let Viem Estimate Approval Gas

During preparation, Viem conservatively estimates the request for maximum-size WebAuthn
approvals because key types are not stored in the multisig config. Multiple WebAuthn owners do
not require a manual gas hint.

## See More

<Cards>
  <Card icon="lucide:fingerprint" title="Sign In with a Passkey" description="Create, restore, and use a WebAuthn passkey account." to="/tempo/guides/accounts/passkeys" />

  <Card icon="lucide:square-function" title="Account.fromWebAuthnP256" description="Create an account from a WebAuthn passkey credential." to="/tempo/accounts/account.fromWebAuthnP256" />

  <Card icon="lucide:send" title="Send Transactions" description="Collect independent approvals from multisig owners." to="/tempo/guides/multisig/send" />
</Cards>