# HEADER_TYP

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

Defined in: [packages/filecoin-encryption-envelope/src/constants.ts:20](https://github.com/FilOzone/synapse-sdk/blob/4fe24ea1c76c9b1fa1489b7cdbb1cc279bd2576a/packages/filecoin-encryption-envelope/src/constants.ts#L20)

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