# HEADER_APP_METADATA

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

Defined in: [packages/filecoin-encryption-envelope/src/constants.ts:38](https://github.com/FilOzone/synapse-sdk/blob/4fe24ea1c76c9b1fa1489b7cdbb1cc279bd2576a/packages/filecoin-encryption-envelope/src/constants.ts#L38)

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