Sync nodes, file nodes, consensus nodes and a coordinator each have one job, and a node runs the same code as a device.

It names the pieces the next units refer to.

The infrastructure has four kinds of node. Each has one job.

Sync nodes store and relay spaces. Guest lists and envelopes. All sealed. Several nodes hold each space.

File nodes store encrypted file blocks.

Consensus nodes validate the guest list.

The coordinator keeps the configuration. Which nodes exist. Which spaces exist. Where invites are stored.

A node runs the same code as a device. Every node is just another peer. One that happens to be always on.

Check yourself. Which node validates the guest list?