In RGB++, isomorphic binding is a trustless mechanism that links state changes and asset management between the Bitcoin blockchain and the Nervos CKB blockchain. It does so by mapping Bitcoin's Unspent Transaction Outputs (UTXOs) to CKB's Cells (an extended UTXO design of Nervos CKB, more to read: What is Cell Model), facilitating synchronized operations across both blockchains without the need for a centralized authority or trust in intermediaries.

首先，ERC-6551 不是 Token 标准，它跟 ERC-721 等不是一个范畴的概念，而是更像 ERC-4337 —— 是的你没听错，它更像一个 AA 标准，只不过是应用层的标准。如果说最像的，应该是（私货预警 😛）ERC-7093 的社交恢复标准，都是在考虑 AA 应该怎么用。所以你可以说「UniPass v2 是 4337 / 6551 / 7093 兼容的 AA 账户」，但是并不存在「ERC-6551 兼容的 NFT」这种说法。

One of the most talked-about subjects at DevCon was account abstraction. Recently, you may have noticed acronyms and abbreviations like AA, EOA, SCW, and 4337 in a variety of presentations, panels, and streams. After reading these two sentences, your brain must already be hurting. Next, I'll try to help you figure out what all these terms and ideas really mean.

刚刚结束的 Devcon 上，账户抽象算是是最热的几个话题之一，最近可以经常看到 AA / EOA / SCW / 4337 等缩写和代号在各种 talk、panel 和信息流里出现。再加上叙事开始往「Onboarding next billion users」的方向发展，一些新的形容词也开始出现在产品之前，比如 seedless / gasless / social recovery / non-custodial。相信看完这两句的你已经开始脑壳疼了，那么接下来就让我尽自己所能来帮大家梳理一下这些名词概念到底代表什么。

Hello UniPass