What Is a Wallet Proxy — And Why Blockchains Need One

In traditional web architecture, applications rarely talk directly to databases exposed on the public internet. There is always a layer in between — a gateway, a proxy, an abstraction.
Yet in blockchain infrastructure, many systems still connect directly to node RPC endpoints as if they were safe application interfaces.
They are not.
A blockchain node is a state machine.
An RPC endpoint is an operational interface.
Neither is designed to be a deterministic payment layer for applications.
This gap is where the concept of a Wallet Proxy emerges.