# Function: getAliasDerivationKeysForBadge()

> **getAliasDerivationKeysForBadge**(`collectionId`, `tokenId`): `Buffer`\<`ArrayBufferLike`\>[]

Defined in: [packages/bitbadgesjs-sdk/src/core/aliases.ts:71](https://github.com/BitBadges/bitbadgesjs/blob/master/packages/bitbadgesjs-sdk/src/core/aliases.ts#L71)

Derivation keys for a badge alias to be used in `generateAlias`.

## Parameters

### collectionId

`string`

### tokenId

[`NumberType`](https://docs.bitbadges.io/sdk/reference/type-aliases/number-type)

## Returns

`Buffer`\<`ArrayBufferLike`\>[]