0:00
(欢快的音乐)
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- 嗨，欢迎收听CD Pod特别篇。
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今天我没有和Yuga一起，
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而是和X4OTT的Carson和Amanda一起
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出镜。
0:21
我们要尝试在新的一天做点新东西。
0:24
我们将做一个技术专题讲解，
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介绍一个刚刚上线的新功能，
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X4OTT对任意ERC-20代币的支持。
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背景是，X4OTT一直想
0:37
支持任何任意的ERC代币，
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并且它确实支持，这一点与许多链不同。
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EVM上的代币难点在于
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很多代币都比较老，
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可能不支持最新的
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基于签名的转账方式。
0:59
所以我们利用了permit来支持
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基于签名的转账。
1:06
但permit的一个问题是，一旦你授权了
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某人代你转账，
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对方就能转移任意数量的代币。
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所以Carson，我们是怎么做的，
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让facilitator不能随意代表你
1:19
转账任意数量代币的呢？
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- 我们写了一个叫X4OTT
1:25
to exact permit代理合约。
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这个合约的作用是，
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基本实现EIP-3009的保障，
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但使用permit流程。
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具体来说，当facilitator
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使用这个合约以permit流程结算时，
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除了permit原有的安全保障，
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我们还强制规定了转账目的地和金额。
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通过我们的permit整合和合约，
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我们将permit流程
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提升到了跟3009相同的安全保障。
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- 这意味着你作为用户，
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你不再是授权facilitator，
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而是授权X4OTT的permit代理合约。
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- 是的，没错。
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你这时候是在授权permit代理合约。
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- 然后你签署一条消息，
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把它发送给facilitator，
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facilitator会跟permit代理合约交互，
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那个代理合约会检查支付是否
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符合约定。
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然后它只会按照你签署的内容
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转移资金，
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这样facilitator就不能随意调度你的资金，
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因为这是由代理合约强制执行的。
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- 但是这里还有个问题，
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很多老代币只支持普通授权，
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你必须把交易广播上链，
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才能让对方有权代表你操作代币。
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这跟我们X4OTT让操作更便捷的目标
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是矛盾的，
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你能说说我们怎么为用户
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创造了无Gas体验，
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并让它适配任意代币的吗？
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- 基本上这里有两类代币。
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一类是支持permit的，也就是2612代币，
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这类代币内置了链上permit功能，
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另一类是老旧代币，
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比如普通ERC20代币如USDT，
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它们不支持这种功能，
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我们需要另行解决。
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所以我们做了两套Gas赞助方案，
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针对新代币的有EIP2612 Gas赞助扩展，
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这套方案保持EIP3009流程，
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用户签一个签名，
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就能原子化完成permit和结算，
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通过我们的合约实现。
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而对于老代币，
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我们采取的是不同流程，
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用户得签署一个普通授权交易，
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但我们不直接上链，
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而是把它作为X4的payload的一部分，
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当facilitator遇到这种情况，
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它会先给你的账户转一点ETH，
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足够你支付授权的Gas，
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然后再帮你把授权交易上链，
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再进行后续操作。
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这样的话，
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这个无Gas体验
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就实现了一个三步连贯流程。
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will be required.
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The way that we've accomplished a GASIS flow here
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is this three-step scenario
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where when a client sees that extension,
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they will sign an ERC20 approved,
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but they do not put it on chain.
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They include it as part of the X4 to payload.
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And then on the facilitator side,
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when it runs into this scenario,
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it will send your account a little bit of ETH
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just enough to cover the GAS or the approve,
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and then immediately call the,
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or like put your approved transaction on chain,
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and then it will call so.
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So it ends up being three back-to-back operations
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这基本上为旧代币启用了GASIS流程
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这些代币至今还没有体验过GASIS。
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- 太棒了。
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Amanda，你想跟我们讲讲现在看到的情况吗
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现在你可以使用任何EVM代币
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这适用于任何EVM链吗？
5:32
- 是的，所以你可以使用任何ERC20代币
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只要它兼容任何EVM链
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这个合约可以更商业化一些，
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这真的很棒。
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我们已经看到的人使用它的几种方式
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就是他们建立了自己的生态系统
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使用自己的ERC20代币支付
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生态系统中的商品给用户。
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还有一个，就像Carson提到的，
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旧代币比如USTT，
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在美国外有大规模采纳度，
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你现在可以使用它们，
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这就打开了一个广泛的全球市场。
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机会，另一个我还没见过，
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但我很好奇会不会出现的是游戏代币
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因为现在你可以使用任何ERC20，
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这可能是游戏代币，
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并且它有免gas功能。
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所以你可以直接，
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用户不用感知，流程无缝，
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可以购买新游戏物品、支付费用，
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也可以转账。
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哦，如果你是代理，
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手头没有USDC，
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但是有其他被资源服务器接受的代币，
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你现在不必进行兑换，
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也不用担心滑点问题，
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或者任何不确定因素，
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你可以直接使用
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你的代理钱包中传递的代币，
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这非常令人振奋。
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是的，基本上无限可能。
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- 你会说我们要飞月球吗？
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(笑)
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- 姐妹们。
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- 去月球，我会这么说。
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好了，总结一下，第一，
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我们长期支持大多数链上任意代币的导出，
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比如Slauna、Aptos，许多非EVM链
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从一开始就支持任意代币。
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而在EVM链上长期以来，
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导出只支持EIP 309兼容的代币，
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这是因为我们想给所有用户带来
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免gas的体验。
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今天我们宣布的是，
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你现在可以通过我们部署的新合约
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在任何EVM链上使用任何代币
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享受完全的免gas体验。
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这是一个完全开放权限的合约，
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任何人都可以在任何链上部署，无需我们参与，
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还有一个新的扩展支持
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旧ERC20代币合约的初始审批的微gas赞助。
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所有这些结合在一起，
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让我们现在支持在任何链上的任意代币导出。
7:56
这次分享很棒。
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非常感谢Amanda和Carson加入我，
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这很有趣。
8:05
我们应该多做这种CDPODA上的构建更新。
8:07
- Eric？
8:10
- 谢谢邀请。
8:11
- 通过Coinbase开发者平台构建，
8:14
推动世界的链上转型。
8:17
访问我们 cvp.coinbase.com，
8:18
在X上关注我们 Coinbase Dev，
8:20
并务必在你喜欢的播客应用上留下评价。
8:22
Visit us at cvp.coinbase.com,
8:25
follow us on X at Coinbase Dev,
8:27
and be sure to leave us a review
8:29
on your favorite podcast app.
0:00
(upbeat music)
0:02
- Hey, welcome to a special edition of the CD Pod.
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Today I'm not joined by Yuga, settling,
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but I am joined by Carson and Amanda
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from the X4OTT.
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And we're gonna try this on a new day.
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We're gonna do a little breakout technical track
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on a new feature that we just placed
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in X4OTT arbitrary ERC-20 support.
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So the context here is X4OTT has always wanted
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to support any arbitrary ERC, any arbitrary token.
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And it does unlike many, many chains.
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So the difficulty with tokens on the EVM
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is that there are a lot of tokens that quite old
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and they may not support a long tail
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of more modern ways of doing signature based transfer.
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And so we leveraged permit to enable
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signature based transfer.
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But the issue with permit too is that once you approve
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something to transfer on your behalf,
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it can transfer arbitrary amounts of token for you.
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And so Carson, what did we do in order to make it
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so that the facilitator can't just transfer
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arbitrary amounts of tokens on your behalf?
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- So we wrote a contract called the X4OTT
1:25
to exact permit to proxy contract.
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And what this contract enables is essentially
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the guarantees we get out of EIP-3009,
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but with a permit to flow.
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Specifically, this enforces that when a facilitator
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uses this contract to settle with the permit to flow.
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In addition to permit to security guarantees,
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we are also enforcing the destination and the amount.
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So with our permit to integration and our contracts,
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we're able to elevate the permit to flow
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to the same 3009 guarantees that we've come to love.
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- And so what that means is that you as a user,
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you don't approve the facilitator.
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You approve the X4OTT permit proxy contract.
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- Yes, that's correct.
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You are approving the permit to proxy contract in this case.
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- Yeah, and then you sign a message
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and then you send that message to the facilitator.
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The facilitator interacts with the permit
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to proxy contract.
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That proxy contract checks if the payment
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adheres to the specification.
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And then we'll only move funds in accordance
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to what you've signed.
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And you get that same property of the facilitator
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can't arbitrarily route your funds
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because it's enforced via the proxy contract.
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- There's kind of this problem still though, right?
2:53
And that you need to, a lot of older tokens
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only support approvals for permit.
3:02
And that means you have to broadcast
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the transaction on chain to actually have that,
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that whoever you're approving,
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be able to move tokens on your behalf.
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And so that's, of course, in contention
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with our goal of X4OT of making X4OT castle
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a lot of return.
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And so, could you tell us a bit about
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how we created the GASIS experience for users
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and made it work with any possible token?
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- So basically there's two types of tokens here.
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There's tokens that are permit aware,
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which are the 2612 tokens.
3:38
These tokens have built-in functionality
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to be able to put permit on chain.
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And then there's tokens that predate that,
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such as generic ERC20s such as USDT,
3:49
that have no such capabilities
3:52
that we had to separately solve for.
3:54
So to do this, we have two separate
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GAS sponsorship extensions.
4:00
For the newer tokens that are permit to aware,
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we have an EIP2612 GAS sponsoring extension.
4:08
This gets to maintain the same EIP3009 flow
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where you are signing one signature
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and we're able to do both the permit and settle
4:18
atomically through our contract.
4:20
For the older tokens for the more generic ERC20s,
4:24
we had to take a different flow.
4:26
So as a sign transaction for a generic approval
4:31
will be required.
4:33
The way that we've accomplished a GASIS flow here
4:36
is this three-step scenario
4:38
where when a client sees that extension,
4:42
they will sign an ERC20 approved,
4:45
but they do not put it on chain.
4:47
They include it as part of the X4 to payload.
4:50
And then on the facilitator side,
4:53
when it runs into this scenario,
4:56
it will send your account a little bit of ETH
4:59
just enough to cover the GAS or the approve,
5:02
and then immediately call the,
5:04
or like put your approved transaction on chain,
5:08
and then it will call so.
5:10
So it ends up being three back-to-back operations
5:13
that essentially enables a GASIS flow for old tokens
5:17
that to date haven't had a GASIS experience.
5:21
- That's awesome.
5:22
Amanda, do you wanna tell us a bit about what we're seeing
5:26
now that you can use any EVM token
5:29
in this works on any EVM chain?
5:32
- Yeah, so you can use any ERC20 token
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that's compatible with any EVM chain
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that the contract can be more commercial-lessy,
5:41
which is pretty awesome.
5:43
A couple of the ways we've been seeing people use it already
5:46
is they've built their own ecosystem
5:49
that use their own ERC20 tokens to pay
5:52
for things on their own ecosystem to people.
5:54
Another one, like Carson mentioned,
5:56
older tokens like USTT,
5:59
which have massive adoption outside of the US,
6:02
you can now use,
6:04
and so it opens up this like broad global market.
6:08
Opportunity, another one that I haven't actually seen,
6:11
but I'm curious to see if it happens is gaming tokens
6:15
'cause now you can use any ERC20,
6:18
which could be a gaming token,
6:19
and it's got a GAS-less feature.
6:22
So you can just like,
6:24
the user doesn't have to know it's seamless
6:26
and you could buy new game items and could pay stuff,
6:29
you could send things.
6:30
Oh, and if you're like, if you're an agent
6:32
and you don't have USDC,
6:34
but you have this other token that is acceptable
6:36
by the resource server,
6:38
you now no longer have to swap it
6:40
and do like deal with slippage
6:43
and deal with any of those sort of uncertainties,
6:46
you can just use what you pass
6:47
in your agentic pocket,
6:51
which is pretty exciting.
6:52
Like, yeah, the sky is basically the limit.
6:56
- Would you say that we're going to the moon?
6:58
(laughs)
6:59
- The sister.
7:00
- To the moon, I would.
7:03
Okay, to recap, number one,
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we've export to supported arbitrary tokens
7:09
on most chains for a long time,
7:13
like Slauna, Aptos, many of the non-IVM chains
7:17
have supported arbitrary tokens for since inception.
7:20
For a long time on EVM chains,
7:22
export to only supported EIP 309 compatible tokens,
7:27
and that's because we've wanted to deliver
7:30
GAS's experience to all users.
7:32
What we're announcing today is,
7:34
we now have a way for you to have a fully GAS's experience
7:37
on any EVM chain using any token
7:41
via a new contract that we've deployed.
7:44
This is a contract that is fully permissionless to deploy,
7:47
anyone can deploy it on any chain with or without us,
7:49
and a new extension which handles micro-gas sponsorship
7:54
for the initial approval of that contract
7:56
for older ERC 20 tokens.
7:58
All that comes together to make it,
8:00
so we now export on export to any token on any chain.
8:05
So, this has been a great session.
8:07
Thanks so much, Amanda and Carson for joining me,
8:10
and look, this was fun.
8:11
We should do more of these, like, build updates on CDPODA.
8:14
- Eric?
8:17
- Thanks for having us.
8:18
- Leave the world's transition on chain
8:20
by building with Coinbase developer platform.
8:22
Visit us at cvp.coinbase.com,
8:25
follow us on X at Coinbase Dev,
8:27
and be sure to leave us a review
8:29
on your favorite podcast app.
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