Blockchain//Wallet//Network

- Switching networks in Metamask = changing the RPC endpoint URL + Chain ID.

Switching networks in Metamask = changing the RPC endpoint URL + Chain ID.

Metamask has zero knowledge of Docker networks — it only understands RPC URLs and chainIds.

Connecting to local Besu: add custom network with http://localhost:9999 + the genesis chainId.

DApps like Uniswap fail on local networks: the smart contracts don't exist there (different chain)