# HEADER_TYP

> `const` **HEADER\_TYP**: `16` = `16`

Defined in: [packages/filecoin-encryption-envelope/src/cose/constants.ts:53](https://github.com/FilOzone/synapse-sdk/blob/bc8a4b093324ccef9b407251fcf4e91823c6f599/packages/filecoin-encryption-envelope/src/cose/constants.ts#L53)

`typ`, RFC 9052 §3.1. Must equal [ENVELOPE\_TYPE](/reference/filoz/filecoin-encryption-envelope/namespaces/cose/variables/envelope_type/).