關於 dark pool ，我們在網路上蒐集到這些相關的討論、資訊與評價

Brunch = cute + comfy, right? 🙈 Btw, I only stayed out in the pool for 20mins and I got so dark, quickkkk 🥲

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📜 [專欄新文章] Using MPC to Help Achieve Blockchain Privacy

✍️ Yahsin Huang

📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium

This post answers some of the most commonly asked questions about using multi-party computation (MPC) in blockchains.

What is MPC?

Multi-party computation (MPC) is a cryptographic protocol that does a joint computation involving multiple parties over their inputs while keeping those inputs private.

A famous example of MPC is Yao’s Millionaires Problem. Two millionaires want to know who is richer without finding out information about each other’s actual wealth. Naively they can simply tell their wealth to a third party. Then the third party compares their wealth and lets them know who is richer. But then this option is undesirable because the third party learns the information of their wealth.

The challenge of Yao’s Millionaires Problem is the computation wouldn’t be able to have a result without the two parties’ private information. To get the end result, you need those information involved in the computation. But at the same time, you are not allowed to reveal those private information to the party who performs the computation. That’s the main problem that MPC wants to solve.

Why it matters in blockchain?

In the real world, not everyone’s a millionaire. Not everybody wishes to compare their assets and wealth with others. In the blockchain space, there’s a need to ensure the inputs are shielded from multiple parties for privacy purposes; hence, the need for MPC protocols.

If we look at the current landscape of the blockchain world, notice there are blockchains doing great for programmability, such as Ethereum blockchain, allowing developers to build great tools and applications on top of them. There are also blockchains doing great for privacy, such as ZCash blockchain, allowing users to send transactions in a privacy-preserving way.

However, there’s a lack of blockchains that are designed for maximum programmability with maximum privacy. That’s why a lot of folks are pushing forward the work on incorporating MPC protocols into blockchain designs.

Why ZK is not enough?

Zero Knowledge Proofs (ZKP) is great at shielding private information that involves only one party. ZKP alone cannot be applied to provide privacy in multiple-party settings, such as auctions or in the case of Yao’s Millionaires Problem. In those settings, computations would involve private inputs from multiple parties, and so ZKP wouldn’t be enough. We would need to turn to MPC to achieve that.

Recent developments in MPC

In his presentation “MPC as a Blockchain Confidentiality Layer,” Miller gave a high-level overview of how MPC can be viewed as a confidentiality layer for blockchains as illustrated in the slide. Credit: https://youtu.be/0VuBELYfChM

How does MPC work with blockchains?

HoneyBadgerMPC builds a sidechain that performs MPC protocol computation. The sidechain acts as a confidentiality layer to the public blockchain, where secret data is stored.

How can developers build MPC applications?

Developers are able to develop MPC applications with Ratel language. Writing Ratel feels very similar to writing Solidity contracts. The compiler compiles Ratel code into two parts: the Ethereum part, and the MPC as a sidechain part.

Ratel code looks like this: https://github.com/initc3/HoneyBadgerSwap/blob/coconut/ratel/trade.rl

Learn more about MPC as a sidechain

One of the biggest news this past month was you could now play with HoneyBadgerSwap’s demo website. HoneyBadgerSwap is basically a dark pool version of Uniswap using MPC. You will need some Kovan ETH to test it out. Yunqi Li (UIUC, IC3) made a great Medium story about HoneyBadgerSwap. Read it here: “HoneyBadgerSwap: Making MPC as a Sidechain,” published on April 22, 2021.

Watch a really great talk by Andrew Miller “MPC as a Blockchain Confidentiality Layer,” presented at the IC3 Blockchain Camp 2020, to understand the HoneyBadgerMPC protocol more.

If you are someone who would like to delve into the topic with textbooks, be sure to add the book “A Pragmatic Introduction to Secure Multi-Party Computation” to your reading list. The content is available in PDF.

Using MPC to Help Achieve Blockchain Privacy was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.

👏 歡迎轉載分享鼓掌

梧：話說，在下同一個朋友傾緊計，佢問起在下對Bill Hwang爆煲單野點睇，因為佢諗極都諗唔明點解呢單野會爆到出黎，亦有聽人講話呢單野嘅死因係因為D PB無夾定一齊沽所以出事喎……

在下答：「根本就唔關呢D野事，Bill Hwang死唔係死係D貨度，佢本身就無乜點渣貨，佢嘅死因係同時間同好多間Prime Broker（PB）借爆晒margin玩CFD，好似最多攞到10倍8倍leverage……咁正股跌嘅時候佢要補CFD倉（即係補差價），咁佢補唔到咪要default晒佢D CFD囉。

好啦，因為CFD其實係OTC derivatives，所以佢根本就唔洗同PB disclose任何野，亦唔需要disclose佢有咩倉位，而同佢對賭緊嘅PB先至係渣住D unerlying嘅party……好喇，到佢補唔到倉，D PB要斬倉嘅時候先發現：『仆街啦！點解冚世界都沽緊個十隻八隻野嘅？』

剩係禮拜五沽左200億美記貨，dark pool都搞唔掂，所以D PB先焗住掟晒出街……咁所以禮拜五個日咪人踩人囉，先爆呢單野出黎詐嘛。

呢單野香港無咩人講，主要係因為根本無幾多個知道究竟發生緊咩事。」

朋友問：「點解你唔寫？」

所以，呢篇9up文就誕生左了。

王亞茹：這幾天頭好痛啊，還是不去游泳館了吧...
水鬼：約好今天來游泳館的，怎麼還不來？
幾年後...
王亞茹：想起來幾年前約好去游泳館的！
王亞茹：你還在嗎？
水鬼：請問你是？
王亞茹：怎麼換了一只鬼？

结局一的影片：https://www.youtube.com/watch?v=GaL_oeoKlDI

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❤️ 這裡充滿了很多有趣的影片！
❤️ 喜歡我影片的話不妨點個訂閱吧 ➔ http://bit.ly/Fishpaper
❤️ 別忘記給影片按讚，打開訂閱的小鈴鐺哦！

▬▬▬▬▬▬▬▬▬▬▬▬▬
? 超級精彩的影片播放清單 ?

? 恐怖遊戲影片 | HORROR GAMES LIST ➔ https://bit.ly/3gro2Qu

? 糞GAME | 奇葩遊戲 | WEIRD GAME LIST ➔ https://bit.ly/2DBmNQk

? 黑暗詭計 | 黑暗欺騙 Dark Deception ➔ https://bit.ly/3a01pQP

? 恐怖奶奶 | Granny ➔ https://bit.ly/2XshNEr

? 恐怖冰淇淋 | Ice Scream ➔ https://bit.ly/30rYiho

? 恐怖肉先生 (已完結) | Mr. Meat ➔ https://bit.ly/31qcd73

? 恐怖修女 (已完結) | Evil Nun ➔ https://bit.ly/30vsPLl

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? 推特 | TWITTER ➔ http://bit.ly/2nRsmSg
? 微博 | WEIBO ➔ http://weibo.com/fishpaper
? 我的Discord群組 ➔ https://discord.gg/EscFhsx

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?️ GAME LINK ➔ https://store.steampowered.com/app/919330/_/

#紙魚 #替身 #Ghostinthepool

水鬼：今天要抓個替死鬼當我替身哈哈！
王亞茹：哪個死變態在水裏摸我腳踝？！
水鬼：哇！！好臭的腳！手要中腳氣了！

▬▬▬▬▬▬▬▬▬▬▬▬▬

❤️ 這裡充滿了很多有趣的影片！
❤️ 喜歡我影片的話不妨點個訂閱吧 ➔ http://bit.ly/Fishpaper
❤️ 別忘記給影片按讚，打開訂閱的小鈴鐺哦！

▬▬▬▬▬▬▬▬▬▬▬▬▬
? 超級精彩的影片播放清單 ?

? 恐怖遊戲影片 | HORROR GAMES LIST ➔ https://bit.ly/3gro2Qu

? 糞GAME | 奇葩遊戲 | WEIRD GAME LIST ➔ https://bit.ly/2DBmNQk

? 黑暗詭計 | 黑暗欺騙 Dark Deception ➔ https://bit.ly/3a01pQP

? 恐怖奶奶 | Granny ➔ https://bit.ly/2XshNEr

? 恐怖冰淇淋 | Ice Scream ➔ https://bit.ly/30rYiho

? 恐怖肉先生 (已完結) | Mr. Meat ➔ https://bit.ly/31qcd73

? 恐怖修女 (已完結) | Evil Nun ➔ https://bit.ly/30vsPLl

▬▬▬▬▬▬▬▬▬▬▬▬▬

? 推特 | TWITTER ➔ http://bit.ly/2nRsmSg
? 微博 | WEIBO ➔ http://weibo.com/fishpaper
? 我的Discord群組 ➔ https://discord.gg/EscFhsx

▬▬▬▬▬▬▬▬▬▬▬▬▬

?️ GAME LINK ➔ https://store.steampowered.com/app/919330/_/

#紙魚 #替身 #Ghostinthepool

Mega Houndoom has finally made its way to Pokémon GO. Being a dark and fire typing Pokemon, it serves 2 purpose as an attacker. With so many Mega Evolution Pokemon coming to Pokemon GO and many that has already been released, clearly something is wrong with the raid pool as more and more Mega Pokemon are being introduced into the game.

Join me as I travel, eat and play Pokémon GO the way a local trainer would in their own country and city. Visiting one country and one city at at time through Pokémon GO.

Subscribe if you would like to watch my Pokémon GO travel adventure as I visit different countries, cities and communities, https://tinyurl.com/y65jruw2

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