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+## Notes on running an Ethereum node
+
+<br>
+
+### Setting a dedicated hardware
+
+<br>
+
+* [Check estimate of the blockchain size](https://bitinfocharts.com/ethereum/)
+* Minimum specs:
+  - CPU with 4+ cores
+  - 32 GB+ RAM
+  - fast SSD with at least 1T free space
+  - 25+ MBit/sec download internet service
+
+
+
+<br>
+
+### Clients
+
+<br>
+
+
+### The JSON-RPC interface
+
+<br>
+
+* the JSON-RPC API is an interface that allows us to write programs that use an Ethereum client as a gateway to an Ethereum network and blockchain.
+* the RPC interface is offered as an HTTP service on port 8545. For security reasons it is restricted, by default, to only accept connections from localhost.
+