# KEYSPACE_ID_KEY > `const` **KEYSPACE\_ID\_KEY**: `"foc/ks"` = `'foc/ks'` Defined in: [derive.ts:69](https://github.com/FilOzone/synapse-sdk/blob/a3c661408bf8b3cb47684059a425c07b9ae50a64/packages/keysmith/src/derive.ts#L69) The FWSS data-set metadata key naming the keyspace, so the chain alone can list them.