RPC

- Remote Procedure Call: how external applications (DApps, scripts, wallets) talk to blockchain nodes.

Remote Procedure Call: how external applications (DApps, scripts, wallets) talk to blockchain nodes.

JSON-RPC over HTTP is the standard — request/response with JSON payloads.

A node's RPC port is the "front door" for external interaction — read state, submit transactions.

Only nodes with -p mapped ports are accessible from outside Docker.