# 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/bc8a4b093324ccef9b407251fcf4e91823c6f599/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/)