What does a Solana RPC node do when your wallet asks for a balance?

It reads the account from its own copy of the chain state and answers

It forwards the question to every validator and waits for a vote

It downloads the full ledger history and recounts every transfer

It asks the token issuer for the latest number

sendTransaction returned a signature. What does that prove?

The RPC node accepted it and passed it on; it may still fail or expire

The transaction succeeded on chain

Why can the slot number be higher than the block height?

Some slots are skipped and never produce a block

Slots are counted in milliseconds

Block height only counts finalized blocks

Your transaction failed with "blockhash not found". What is the most likely cause?

The recent blockhash expired before the transaction landed

You want PumpFun trades as typed JSON with no decoding code. Which option fits?

A decoded stream such as Enhanced Streams

accountSubscribe on the program

What is the main reason teams move from WebSockets to Yellowstone gRPC?

gRPC gives fuller, filterable, binary-encoded updates straight from Geyser

WebSockets cannot be used on mainnet

gRPC is easier to set up in a browser

///Practice zone

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RPC fundamentals3 questions

Q1What does a Solana RPC node do when your wallet asks for a balance?
Q2getBalance returns 2500000000 for a wallet. How much SOL is that?
Q3sendTransaction returned a signature. What does that prove?

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