轻客户端是大多数应用中完整区块链系统的重要组成部分。CometBFT 为轻客户端应用提供了独特的速度与安全性特征。 参见我们的light 包。

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概述

轻客户端协议的目标，是获取某个近期区块哈希对应的提交结果，其中该提交包含来自上一个已知验证者集合的大多数签名。在此基础上，所有应用状态都可以通过 Merkle 证明进行验证。

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特性

  • 你可以获得 CometBFT 完整的抵押安全性收益； 无需等待确认。
  • 你可以获得 CometBFT 完整的速度优势；交易会立即提交。
  • 你可以以非交互方式获取应用状态的最新版本 （无需向区块链提交任何内容）。例如，这意味着你可以从名称注册表中获取某个名称的最新值， 无需担心分叉审查攻击，也无需提交一次提交并等待确认。它快速、安全且免费。

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从哪里获取可信高度与哈希

Trust Options 获取半可信哈希与高度的一种方式，是查询多个全节点并比较它们的哈希： 
$ curl -s https://233.123.0.140:26657:26657/commit | jq "{height: .result.signed_header.header.height, hash: .result.signed_header.commit.block_id.hash}"
{
  "height": "273",
  "hash": "188F4F36CBCD2C91B57509BBF231C777E79B52EE3E0D90D06B1A25EB16E6E23D"
}

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将轻客户端作为 HTTP 代理服务器运行

CometBFT 内置了 cometbft light 命令，可用于运行轻客户端代理服务器，并对 CometBFT RPC 进行验证。所有能够通过证明追溯到区块头的调用，都会在返回给调用方之前完成验证。除此之外，它提供的接口与完整的 CometBFT 节点相同。 你可以通过运行 cometbft light <chainID> 来启动轻客户端代理服务器，并使用多种标志来指定主节点、见证节点（用于交叉检查主节点提供的信息）、可信头的哈希与高度等。 例如： 
$ cometbft light supernova -p tcp://233.123.0.140:26657 \
  -w tcp://179.63.29.15:26657,tcp://144.165.223.135:26657 \
  --height=10 --hash=37E9A6DD3FA25E83B22C18835401E8E56088D0D7ABC6FD99FCDC920DD76C1C57
如需查看更多选项，请运行 cometbft light --help。
Light clients are an important part of the complete blockchain system for most applications. CometBFT provides unique speed and security properties for light client applications. See our light package.

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Overview

The objective of the light client protocol is to get a commit for a recent block hash where the commit includes a majority of signatures from the last known validator set. From there, all the application state is verifiable with Merkle proofs.

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Properties

  • You get the full collateralized security benefits of CometBFT; no need to wait for confirmations.
  • You get the full speed benefits of CometBFT; transactions commit instantly.
  • You can get the most recent version of the application state non-interactively (without committing anything to the blockchain). For example, this means that you can get the most recent value of a name from the name registry without worrying about fork censorship attacks, without posting a commit and waiting for confirmations. It’s fast, secure, and free!

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Where to obtain trusted height & hash

Trust Options One way to obtain a semi-trusted hash & height is to query multiple full nodes and compare their hashes: 
$ curl -s https://233.123.0.140:26657:26657/commit | jq "{height: .result.signed_header.header.height, hash: .result.signed_header.commit.block_id.hash}"
{
  "height": "273",
  "hash": "188F4F36CBCD2C91B57509BBF231C777E79B52EE3E0D90D06B1A25EB16E6E23D"
}

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Running a light client as an HTTP proxy server

CometBFT comes with a built-in cometbft light command, which can be used to run a light client proxy server, verifying CometBFT RPC. All calls that can be tracked back to a block header by a proof will be verified before passing them back to the caller. Other than that, it will present the same interface as a full CometBFT node. You can start the light client proxy server by running cometbft light <chainID>, with a variety of flags to specify the primary node, the witness nodes (which cross-check the information provided by the primary), the hash and height of the trusted header, and more. For example: 
$ cometbft light supernova -p tcp://233.123.0.140:26657 \
  -w tcp://179.63.29.15:26657,tcp://144.165.223.135:26657 \
  --height=10 --hash=37E9A6DD3FA25E83B22C18835401E8E56088D0D7ABC6FD99FCDC920DD76C1C57
For additional options, run cometbft light --help.