User Guide


Disk Storage

Ledger writes all data under /data/modular/<USER_ID>/LEDGER. In order for data to be persisted, ensure that a persistent partition is mounted under /data. See minfs setup.


Follow the instructions in netstack to ensure that your Fuchsia has Internet access.

Run curl to verify that it worked:


You should see the HTML content of the placeholder page.

Cloud sync

When running in the guest mode, Ledger works locally but does not synchronize data with the cloud.

When running in the regular mode, Ledger automatically synchronizes user data using a communal cloud instance.


Deleting persistent storage (e.g. rm -rf /data) does not erase the Ledger state in the cloud, which will be synced back the next time a user signs in.

In order to reset the Ledger state in the cloud, visit , sign in with the account you want to reset and hit the erase button.

Any device that has local account state synced with the cloud before the erase becomes at this point incompatible with the cloud. Ledger will detect this on each device upon the next attempt to sync, erase all local data and log the user out. The account is usable again immediately after logging back in.

Debug and inspect

The Ledger Debug Dashboard allows you to inspect the local state of the Ledger.

You need to point your browser to the port 4001 of the Fuchsia machine to access the dashboard of the current user. The dashboard is also accessible from any device connected to the fuchsia machine on the same local network.

The dashboard exposes the instances for the current user. When you select an instance, it displays its pages. When you select a page, it displays the commits graph, where the root node is colored in a different color than the other nodes. When you select a commit, it displays its entries (keys, values, priorities), generation (internal Ledger counter) and timestamp.