# encodeUnprotectedHeader

> **encodeUnprotectedHeader**(): [`UnprotectedHeaderMap`](/reference/filoz/filecoin-encryption-envelope/namespaces/cose/type-aliases/unprotectedheadermap/)

Defined in: [packages/filecoin-encryption-envelope/src/cose/headers.ts:1114](https://github.com/FilOzone/synapse-sdk/blob/9ad84d812e1dd635b76420a7d9388555a04f31b6/packages/filecoin-encryption-envelope/src/cose/headers.ts#L1114)

Build the content unprotected header. This profile defines no unprotected
content parameters, so the encoder always emits a new empty map.

## Returns

[`UnprotectedHeaderMap`](/reference/filoz/filecoin-encryption-envelope/namespaces/cose/type-aliases/unprotectedheadermap/)