Polkadot

Polkadot 是一种开源的分片多链协议，它将多个区块链平台联合成一个统一的、可扩展的网络，不仅是代币任何数据或资产类型都可以跨链传输，从而使各种区块链可以相互操作。这种互操作性旨在建立一个完全去中心化的专有网络，由其用户控制，并简化新应用程序、机构和服务的创建。
Polkadot 协议连接公链、私有链、免许可网络、预言机和未来可能出现的任何网络，允许这些独立的区块链通过 Polkadot 中继链无信任地共享信息和交易。
简单来说，Polkadot 是一个&ldquo;区块链的区块链&rdquo;，允许许多不同类型的链在同一个生态系统中安全地工作和交互。
<h4 class="ql-long-58030660" data-header="4">波卡架构</h4>
Polkadot 是一个异构的多链网络，这意味着它将为特定目的设计的各种区块链连接到一个单一的生态系统中。这些不同的第 1 层区块链因其并行处理交易的方式而被称为平行链，并通过 Polkadot 中继链连接在一起。
Polkadot 有四个核心组件：
中继链：Polkadot 的&ldquo;心脏&rdquo;，帮助跨不同链的网络创建共识、互操作性和共享安全；
平行链：可以拥有自己的代币并针对特定用例进行优化的独立链；
平行线程：类似于平行链，具有基于即用即付经济模型的灵活连接；
跨链桥：允许平行链和平行线程与以太坊等外部区块链连接和通信。
<h4 class="ql-long-58030660" data-header="4">波卡共识</h4>
Polkadot 使用提名权益证明（NPoS），增加了验证者和提名者的角色，以最大限度地提高链的安全性。&nbsp;Polkadot NPoS 中的四个角色及作用：
验证者（Validators）
验证者通过质押原生代币 (DOT) 来保护中继链。如果被选入活跃集，他们会验证平行链上校对者的证明，参与与其他验证者的共识，并在中继链上生成区块。作为回报，他们会获得质押奖励。
提名人（Nominators）
提名人还通过质押他们的 DOT 来支持值得信赖的验证人，从而帮助他们进入活跃的验证人集，从而为网络的安全做出贡献。作为回报，提名者通常会从该验证者那里获得一部分抵押奖励。
校对员（Collators）
整理者收集平行链交易并为中继链上的验证者生成证明。他们还可以使用跨链消息传递协议（XCMP）从其他平行链发送和接收消息。
渔民（Fishermen）
渔民监控网络并向验证者报告不良行为。任何平行链全节点都可以扮演渔夫角色。
<h4 class="ql-long-58030660" data-header="4">DOT代币</h4>
Polkadot 的原生 DOT 代币有三种用途：保证网络的运行和安全，质押DOT以将链连接到 Polkadot 作为平行链及持有者在网络治理中的投票权。DOT 是通货膨胀的，这意味着与比特币不同，DOT 没有最大数量。通货膨胀率不是固定的：它被设计为第一年的 10%。生成的 DOT 用于奖励验证者，其余部分将进入国库。

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0xa2c49cee16a5e5bdefde931107dc1fae9f7773e3

波卡 (DOT) 简介

2017年10月，波卡通过出售了总量一半即500万枚的代币DOT，筹得48万个ETH，价值约1.44亿美金，项目估值达到2.88亿美元，投资方包含Boost VC、Pantera Capital、Polychain等机构。

荷兰式拍卖

2019年6月，波卡开启了第二轮私募，出售了50万枚DOT，获得投资6000万美金，项目整体估值达到12亿美元。

私募

2020年7月，Polkadot举行了第三轮私募，以每枚125美元的价格出售了不到35万枚DOT，又筹集到了4300万美元。DOT总融资额超过2.5亿美元（包括被冻结的9000万美金）。

公募

2021年1月17日，超3000万枚DOT私募额释放。
2021年1月12日，Polkadot 0.8.27版本推出。
2021年1月11日，波卡测试网Rococo V1已于1月11日开放平行链测试资格注册。
2021年1月6日，波卡Participation Lottery模块代码已被并入Substrate库。
2020年12月23日，平行链测试网Rococo V1已启动并运行。
2020年11月15日，波卡高优先级升级0.8.26-1已发布。
2020年10月15日，波卡召开Substrate开发者会议 2020年10月12日，波卡增加验证人公投已通过。
2020年9月23日，波卡开发基础框架Substrate发布更新。
2020年9月18日，波卡建立去中心化平台Polkadot Treasury。
2020年8月22日，波卡已完成DOT 1:100拆分。
2020年8月19日，波卡DOT代币转账开启。
2020年8月7日，Polkadot已启动测试网Rococo。
2020年7月27日，波卡第三轮公募。
2020年6月18日，波卡NPoS模式已上线，验证人节点已增加至100个。
2019年8月8日，Polkadot完成主网映射合约的安全审计。

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