![]() This means that it is sensible to wait until a few additional blocks have been confirmed before trusting the validity of a recently-mined transaction. Instead they fetch block headers by requesting them from full nodes and check their proof-of-work (PoW), assuming the heaviest chain is valid. Because they don't keep local copies of the Ethereum state, light nodes can't validate the blocks in the same way as the full nodes. However they have different security guarantees than full nodes. The result of this is that Geth nodes run in light mode often struggle to find peers.Ī light client can be used to query data from Ethereum and submit transactions, acting as a locally-hosted Ethereum wallet. For those reasons light servers are rather rare and can quickly become overwhelmed by data requests from light clients. There is no monetary incentive for full nodes to run light servers and it is an opt-in, rather than opt-out function of a Geth full node. However, the cost of this performance increase is that a light Geth node depends heavily on full-node peers that choose, for altruistic reasons, to run light servers. Light mode can catch up much quicker after having been offline for a while.Light mode is suitable for resource-constrained devices.Light mode is lighter on CPU and other resources.Light mode uses significantly less storage.Syncing takes minutes rather than hours/days.
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