#分布式
之前说DDIA缺少很多技术原理的讲解，我春节期间看分布式事务这部分，DDIA第七章也是点了一下Serializable Snapshot Isolation（简称SSI），但是同样的也是没有给出技术原理的讲解。
就像一个清晰度不够高的图片，初看是感觉什么都有了，想放大了看细节，对不起没有。
初看觉得DDIA是神书，现在也慢慢祛魅了。
（附图是DDIA书中对Paxos等共识算法的一笔带过。一本讲分布式的书，如果不讲共识算法，那有40%以上的东西没讲到）
BY codedump的电报频道
Most people buy Bitcoin via exchanges, such as Coinbase. Exchanges allow you to buy, sell and hold cryptocurrency, and setting up an account is similar to opening a brokerage account—you’ll need to verify your identity and provide some kind of funding source, such as a bank account or debit card. Major exchanges include Coinbase, Kraken, and Gemini. You can also buy Bitcoin at a broker like Robinhood. Regardless of where you buy your Bitcoin, you’ll need a digital wallet in which to store it. This might be what’s called a hot wallet or a cold wallet. A hot wallet (also called an online wallet) is stored by an exchange or a provider in the cloud. Providers of online wallets include Exodus, Electrum and Mycelium. A cold wallet (or mobile wallet) is an offline device used to store Bitcoin and is not connected to the Internet. Some mobile wallet options include Trezor and Ledger.
Telegram is a free app and runs on donations. According to a blog on the telegram: We believe in fast and secure messaging that is also 100% free. Pavel Durov, who shares our vision, supplied Telegram with a generous donation, so we have quite enough money for the time being. If Telegram runs out, we will introduce non-essential paid options to support the infrastructure and finance developer salaries. But making profits will never be an end-goal for Telegram.
telegram from ar