Coinbase 成立于2012年，总部位于美国，它拥有正规的运营执照，能为机构和专业人士提供比特币，以太坊等数字资产的交易。成立伊始，Coinbase便提出了一个激进的想法，即任何人在任何地方都应该能够轻松、安全地应用比特币。如今，有超过100个国家的3500万人应用Coinbase 购买、销售、存储、使用和赚取加密货币。

Optimism

Optimism 是第一个开发与以太坊虚拟机 (EVM) 兼容的 Optimistic Rollup 解决方案的以太坊 L2。Optimism 与以太坊并行，能够在继承以太坊安全性的同时大规模处理交易。
Optimistic Rollup 得名于交易处理的方式。默认情况下，交易被乐观地假设为准确且不执行任何计算。它依靠防欺诈机制来确保交易的合法性。验证者（任何运行 Optimism &ldquo;全节点&rdquo;的人）都能够挑战排序器（sequencer）提交的交易提案的有效性，然后Rollup将通过在以太坊上执行交易的计算来进行检查。交易提案可以在挑战期内受到挑战，Optimism 设置为 1 周，然后才最终确定并提交到以太坊主网。
如果提案被证明是欺诈性的，则验证者将获得奖励，而sequencer将受到惩罚。奖励取自sequencer需要绑定的绑定 ERC-20 代币池。在 Optimism 的情况下，所需的代币是 ETH。这创造了一种激励机制，其中激励验证者捕捉不良行为者，激励sequencer只提交准确的交易提案。欺诈性提案被删除，正确的提案被最终确定。交易本身不会被还原，只会删除交易的欺诈性提议结果。
Optimism 有 4 个主要好处：EVM 等效性、数据安全性、速度和成本。
Optimism 是最兼容 EVM 的链之一，它的重点是更进一步并与 EVM 等效。Optimism 能够使用其 Optimistic 虚拟机 (OVM) 支持任何以太坊应用程序，该虚拟机是与 EVM 兼容的虚拟机。开发人员能够将任何基于以太坊的 dApp 部署到 Optimism 上，几乎不需要架构更改。这允许构建在以太坊上的去中心化应用程序（dApps）无缝集成到 Optimism 上。
与像 Ronin 这样的侧链（Axie infinity所采用的）在独立运行时具有自己的安全性不同，像 Optimism 这样的rollup从以太坊主网获得安全性。交易在 Optimism 上处理，但交易的数据被写入并存储在以太坊上。这允许 Optimism 在保持可扩展性的同时继承以太坊的安全性。
计算是使用以太坊过程中缓慢而昂贵的部分。通过默认不计算交易，Optimism 能够根据交易的性质实现 10-100 倍的可扩展性改进。Optimism 具有近乎即时的交易最终性，使用户能够几乎立即检查其交易结果。Optimism 的交易也很便宜，成本只是以太坊交易成本的一小部分。目前，Optimism 的基本转账费用为 1.66 美元，而以太坊的基本转账费用为 8.77 美元（请参阅此处的实时费用）。Optimism团队估计，在网络上处理的交易中，他们总共节省了 3.35 亿美元以上的gas费。

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Optimism (OP) 简介

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github

https://cdn.mytoken.org/out/8cc39b3f7fb16f64048b3cf257f2d546

Base 與 OP 頂級 DEX 將合並，擴展部署至 Arc 與以太坊

https://cdn.mytoken.org/out/8a1b3af5f028e20c411e17fc3f2f49c8

公募13.9亿，挑战BASE和OP，MegaETH能否撕开Layer2新格局？

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