# 关于 Andre Cronje

上一周让请銘峰 Review [我的书稿](https://matataki.io/p/5040)，他提到我漏掉了一个模块，去中心化保险，比如 [Nexus Mutual](https://nexusmutual.io/)。

结果昨天晚上 Andre Cronje 就发了一篇 [yinsure.finance 的预告](https://medium.com/iearn/yinsure-finance-a-new-insurance-primitive-77d5d4217896?source=---------2------------------)，[结果当然就是。。。](https://www.odaily.com/newsflash/206503)

如果想要理解 2020 年的 DeFi 如何与 [2019](https://github.com/carboclan/Slides/tree/master/2019%20Osaka.WTF/Speakers%20Presentation) 年不同，最好的方法就是 [读 Andre Cronje 的 Medium 文章了](https://medium.com/iearn/archive)，因为 yearn 作为 DeFi 聚合器，需要与几乎所有其他重要的项目进行交互。。。最近这段时间基本爬完了他的 Medium 文章，我遴选出几篇我最喜欢的。。。

## Building in #DeFi Sucks

> 天降大任于斯人也，必先苦其心志，劳其筋骨，饿其体肤，空乏其身，行指乱其所为，所以动心忍性，曾益其所不能。
> —— 孟子

首先是 [Things I wish I knew before building Ethereum #DeFi dapps](https://medium.com/iearn/things-i-wish-i-knew-before-building-ethereum-defi-dapps-cd6bf0f07a16) 和 [Building in #DeFi sucks](https://medium.com/@andre_54855/building-in-defi-sucks-b8fdfda0ef58)，这两篇都还是 2 月份的时候的抱怨文，我们可以从中看到 Andre Cronje 能有今天在行业中的地位，绝对是实打实一步一步积累和磨练出来的。我虽然也部署过几个主网合约，但是也都没有那么复杂的交互，Andre Cronje 光部署合约就花了 70 多 eth，可见一斑。

我 highlight 的几个段落：

> The testnets are great, Kovan and Ropsten, but I could not find or replicate a lot of the contracts I’m interacting with (since I’m working with uniswap, 1inch, compound, dydx, fulcrum, aave, curve.fi, lendf, ddex it just wasn’t possible to replicate on testnet). So I had to do a lot of dev and testing on mainnet. The other problem, I’m very impatient, so I always pay the highest fees, but when you are in a dev test cycle, this is important.
>

> You won’t get community support unless you already have a community, which you can’t get without support.

其中最惨的是，除了 uniswap，weth 等少数几个合约在测试网上有镜像之外，很多对应的项目在测试网都没有，使得 Andre Cronje 不得不花费不菲的代价，在主网进行测试。

想到当时在谷歌内部做分享的时候我做了一个 I don't always test my contract 的 meme，后来前年和 gaojin 去台北参加 hackathon 的时候在 [Demo 的时候](https://docs.google.com/presentation/d/1i_OT_1GYFHmR3KqVA5mJDyNcKQhrYFoY3M9WIK8kQUw/edit#slide=id.g3605ed66fa_0_7) 还用了这个图。


但真的想不到有人会不得不这么做，他就是 Andre Cronje，这应该是了解他的第一步。。。


## How to deploy your own yearn.finance

[How to deploy your own yearn.finance](https://medium.com/@andre_54855/how-to-deploy-your-own-iearn-finance-5f90095fa04e)

另一个我非常喜欢 Andre Cronje 的一点，就是他的分享精神。

例如第一篇就是教大家怎么查询 On-chain APR ——
[How we built on-chain APR for Ethereum DeFi](https://medium.com/iearn/how-we-built-on-chain-apr-for-ethereum-defi-a8d84b680758)。

他在博客里分享了非常多自己在开发过程中踩过的坑。在上面这篇这种，他甚至很 Honest 的说出了目前 yearn.finance 的问题，因为所有资金都作为整体进行决策，当有部分 pool 的收益比较高但深度不足时，yearn.finance 目前的架构只有放弃。因此 Andre Cronje 甚至鼓励大家对 yearn.finance 进行 fork，手把手教你如何构建自己的 yearn.finance，以使用更加定制化的策略。

> Cheat Sheet
Launch a token, premine 50%, lockdrop the other 50% for AUM providers once off, get funding with the 50% of tokens, get a few VC’s, use $20k to build the product (or just copy iearn.finance for free) throw all the capital you raised into the “starter fund” to create massive interest rates (2x what others are offering). Because your rates are so high add system tax (15% of interest above the nearest competitor), which no one cares about because they still make ~2x-15% vs your competitors. Pay those taxes out to token holders which grows with AUM (which you already increased because of your 50% lockdrop) so you have network capture value.
Don’t do it the way I did it, which was hard, cost me a lot of money, and has created very little network effect.
Lessons learned.
—— [Things I wish I knew before building Ethereum #DeFi dapps](https://medium.com/iearn/things-i-wish-i-knew-before-building-ethereum-defi-dapps-cd6bf0f07a16)

甚至在上面的文章中，还能找到这样不免有一些自嘲的段落。

## AMM —— a new kind of stable coin
https://medium.com/iearn/yield-stable-coins-103-717b097213f1

这篇的观点几乎前年我和 [Necokeine](https://twitter.com/Necokeine) 在做 Bancor 交易所的时候如出一辙，但是 AC 的 techinial writing 显然更好，把我很多不明白怎么表述的观点都说出来了。

## Yield farming 101

https://medium.com/iearn/yield-farming-101-d983a27c542e

AC 关于 Yield Farming 的系列文章的第一篇，建议大家都反复阅读。其中 AC 在很多篇文章中，都不吝对 curve 的溢美之词。。。

> Along came CRV, a new simpler (not in math, but design), Automated Market Maker (AMM), which allowed a new way to farm yield on stable coins. You provide DAI and/or USDT and you earn trading fees.

结论就是 curve 才是这一波里，真正小而美的，解决 Market-Product Fit 的产品！！。。。