其原理是:假设两个使用IP协议的站点A、B通过第三层交换机进行通信,发送站点A在开始发送时,把自己的IP地址与B站的IP地址比较,判断B站是否与自己在同一子网内。若目的站B与发送站A在同一子网内,则进行二层的转发。若两个站点不在同一子网内,如发送站A要与目的站B通信,发送站A要向“缺省网关”发出ARP(地址解析)封包,而“缺省网关”的IP地址其实是三层交换机的三层交换模块。当发送站A对“缺省网关”的IP地址广播出一个ARP请求时,如果三层交换模块在以前的通信过程中已经知道B站的MAC地址,则向发送站A回复B的MAC地址。否则三层交换模块根据路由信息向B站广播一个ARP请求,B站得到此ARP请求后向三层交换模块回复其MAC地址,三层交换模块保存此地址并回复给发送站A,同时将B站的MAC地址发送到二层交换引擎的MAC地址表中。从这以后,当A向B发送的数据包便全部交给二层交换处理,信息得以高速交换。由于仅仅在路由过程中才需要三层处理,绝大部分数据都通过二层交换转发,因此三层交换机的速度很快,接近二层交换机的速度,同时比相同路由器的价格低很多。

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In 2018 Coinbase launched their independant mobile wallet for iOS and Android. The wallet stores the private keys on the user’s device and only they have access to the funds. This brings Coinbase full circle as it started out as a wallet, transitioned to an exchange only (claiming that they are not a wallet) and now they are offering wallet services again.

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Coinbase had announced in late September that it is looking to quickly add new cryptocurrencies that meet its standards and meet local law compliance. The exchange recently started supporting Ethereum Classic, and now there’s talk that it could list Ripple as well. The exchange has justannounced that Coinbase Custody, its branch providing custodian service for institutional investors, is now adding support for Ripple (XRP).

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Coinbase was founded in June 2012 by Brian Armstrong and Fred Ehrsam.[6][7] Blockchain.info co-founder Ben Reeves was part of the original founding team but later parted ways with Armstrong due to a difference in how the Coinbase wallet should operate.[8] The remaining founding team enrolled in the Summer 2012 Y Combinator startup incubator program. In October 2012, the company launched the services to buy and sell bitcoin through bank transfers.[9] In May 2013, the company received a US$5 million Series A investment led by Fred Wilson from the venture capital firm Union Square Ventures.[10] In December 2013, the company received a US$25 million investment, from the venture capital firms Andreessen Horowitz, Union Square Ventures (USV), and Ribbit Capital.[11]

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Hey to all. Since around 2 months, I am with 99bitcoins reading and getting info and I am very happy here, thanks for a good site. For my bad luck I did not check here for a review of coinbase, I would have save a lot of worthless time. To tell the truth, I hope there is a internet god out there and shut them down. I did not know about their support in US, but as I read the first reviews here, it seems they make themselves a pretty bad place there too. I am located in the D.R.,… Read more » 

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Coinbase has two core products: a Global Digital Asset Exchange (GDAX) for trading a variety of digital assets on its professional asset trading platform, and a user-facing retail broker of Bitcoin, Bitcoin Cash, Ether, Ethereum Classic, and Litecoin for fiat currency.[24] It also offers an API for developers and merchants to build applications and accept payments in both digital currencies. As of 2018, the company offered buy/sell trading functionality in 32 countries,[42] while the cryptocurrency wallet was available in 190 countries worldwide.[43] On March 26, 2018, Coinbase announced their intention to add support for ERC-20 tokens.[44]

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Coinbase is one of the most popular ways to buy Bitcoins, and it is now looking to take the ease of use that it provides one step further. The cryptocurrency exchange recently announced that it is raising $300 million as a part of Series E financing at a value of more than $8 billion. Tiger Global Management is leading this financing round, while the other participants include Wellington Management, Andreessen Horowitz, Y Combinator Continuity, Polychain, and others.

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In January 2015, the company received a US$75 million investment, led by Draper Fisher Jurvetson, the New York Stock Exchange, USAA, and several banks.[20] Later in January, the company launched a U.S.-based bitcoin exchange for professional traders called Coinbase Exchange.[21] Coinbase began to offer services in Canada in 2015,[22] but in July 2016, Coinbase announced it would halt services in August after the closure of their Canadian online payments service provider Vogogo.[citation needed]

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In August 2019, Coinbase announced that it was targeted by a sophisticated hacking attack attempt in mid-June. This reported attack used spear-phishing and social engineering tactics (including sending fake e-mails from compromised email accounts and created a landing page at the University of Cambridge) and two Firefox browser zero-day vulnerabilities. One of the Firefox vulnerabilities could allow an attacker to escalate privileges from JavaScript on a browser page (CVE-2019–11707) and the second one could allow the attacker to escape the browser sandbox and execute code on the host computer (CVE-2019–11708). Coinbase's security team detected and blocked the attack, the network was not compromised, and no cryptocurrency was stolen.[39][40][41]

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