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# mnemonicToSeedBytes()

> **mnemonicToSeedBytes**(`phrase`, `passphrase?`): `Uint8Array`

Defined in: [metacomputer/gen-framework/client-and-test-utils/client-sdk-ts/packages/client-sdk/src/signer/derivation.ts:261](https://github.com/gen-bc/gen/blob/main/metacomputer/gen-framework/client-and-test-utils/client-sdk-ts/packages/client-sdk/src/signer/derivation.ts#L261)

## Parameters

### phrase

`string`

### passphrase?

`string` = `''`

## Returns

`Uint8Array`