The successor to DATUM, rebuilt for native PolkaVM and for life inside the Polkadot app, where the old EVM build had 213 bytes of headroom left in its largest contract.

broadside.dot currently serves the seam probe: a key derived inside the Polkadot app signs an EIP-712 payload that a native PolkaVM contract recovers on chain, routed through the host with no external RPC, no user tap, and no funds on the signing key. All six gates passed on a Pixel 10 Pro XL on release day.