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Ethereum light client

ethereum light client

[решено] Я хочу переместить некоторый ETH из обмена в кошелек, для которого я Вместо SPV он будет называться Light Client, а протокол для его разработки. An introduction to the JavaScript client libraries that let you interact with yarbit.ru - A high-level reactive JS library optimized for light clients. Learn how to develop for Ethereum using Go-based projects and tooling. Geth Light Client - Light Ethereum Subprotocol's Geth implementation.

Ethereum light client

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The problem with light clients is finding full nodes to peer with. Light clients depend entirely on full nodes accepting light clients as peers. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Ask Question. Asked 1 year, 7 months ago. Active 1 year, 7 months ago. Viewed times. How much time it takes to re-sync after 1 week break? Improve this question. Robert Zaremba Robert Zaremba 4 4 silver badges 12 12 bronze badges. Add a comment.

Active Oldest Votes. Resource usage tends to be very light for light clients. You can usually stay under MB of RAM, and CPU utilization is just a few cycles to verify block headers every 15 seconds or so when new blocks come out. Each build of the client ships with a checkpoint for the network, and it only has to sync forward from that checkpoint. Improve this answer. Is Geth LC production ready? After checking in other places gitter go-ethereum it seams that Geth LC is production ready.

However, downloading and verifying the whole chain of blocks takes time and resources. As an example, using an SSD is now required to fully synchronize the Ethereum blockchain. Nowadays, organizations and individuals run full nodes because they need it for their business. Think about miners, block explorers, exchanges. Individual users might want to run a full node because it is the most secure way to interact with the blockchain. At a much smaller scale, they might also do it by pure altruism to help the network.

Except for miners, there is no built-in incentive to run a full node despite this piece of infrastructure being critical to the network. As a result, most users interacting with the blockchain will, voluntarily or not, use a centralized piece of infrastructure. The most popular software wallets rely per default on a 3rd-party hosted node. These clients connect to a remote node and completely trust its responses in a non-cryptographically-proven manner.

The positive aspect of it is obviously the enhanced user experience as the users of these wallets do not need to run their own node. However, they are forced to trust a third party node. Metamask, MyEtherWallet, and MyCrypto connect to a remote node by default but still allow users to connect to their own local node if they wish to.

Mobile wallets are not mentioned here, as mobiles phone are not able to run full nodes. Companies such as Infura are dedicated to running full nodes and make them available to those who need them, for free. Abstracting the hassle to synchronize a full node allows any user to access the blockchain effortlessly. Such solutions help to make Ethereum accessible to more users. However, even though this initiative has been a great addition to the ecosystem, it represents a centralized single point of failure that is antithetical to the decentralized blockchain philosophy.

Until a couple of months ago, wallet developers did not have any other choice. A light client or light node is a piece of software that connects to full nodes to interact with the blockchain. In fact, light clients do not interact directly with the blockchain; they instead use full nodes as intermediaries.

Light clients rely on full nodes for many operations, from requesting the latest headers to asking for the balance of an account. The way light client protocols are designed allows them to interact with full nodes in a trust-minimized manner. Now, back to our light clients. As a starting point, a light client needs to download the block headers of the blockchain. The light client does not need to trust the full node for every request that it makes to the full node. This is because the block headers contain a piece of information called the Merkle tree root.

The Merkle tree root is like a fingerprint of all information on the blockchain about account balances and smart contract storage. If any tiny bit of information changes, this fingerprint will change as well. Assuming that the majority of the miners are honest, block headers and therefore the fingerprints they contain are assumed to be valid. A light client may need to request information from full nodes such as the balance of a specific account.

Knowing the fingerprints for each block, a light client can verify whether the answer given by the full node matches with the fingerprint it has. This is a powerful tool to prove the authenticity of information without knowing it beforehand. As light clients need to send several requests to do simple operations, the overall network bandwidth needed is higher than that of a full node.

On the other hand, the amount of resources and storage needed is several orders of magnitude lower than that of a full node while achieving a very high level of security. Requiring only about MB of storage and low computational power, a light node can run on a mobile device! This means that a cell phone can access the blockchain in a decentralized manner. As it requires a fraction of the information of a full node, a light node can synchronize with a blockchain much faster.

It currently takes about an hour to synchronize the entire Ethereum mainnet blockchain with a light client, but anything more than a couple seconds for the node to sync would be too much for any application. Solutions were developed for light clients to sync with the top of the blockchain quickly, though these solutions often include tradeoffs.

Currently, light clients have a trusted blockchain checkpoint built into their code. Thanks to this, the client only needs to download the latest headers, allowing it to achieve a sync in a matter of seconds.

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