# HEADER_APP_METADATA

> `const` **HEADER\_APP\_METADATA**: `-65792` = `-65792`

Defined in: [packages/filecoin-encryption-envelope/src/cose/constants.ts:75](https://github.com/FilOzone/synapse-sdk/blob/bc8a4b093324ccef9b407251fcf4e91823c6f599/packages/filecoin-encryption-envelope/src/cose/constants.ts#L75)

`app_metadata`, private use. Opaque, string-keyed map carried and authenticated but never interpreted.