Bitcoin (BTC) is the world’s first decentralized digital currency and payment system and is by far the most known and valuable cryptocurrency. It was created in 2009 by an anonymous person or group called Satoshi Nakamoto. Bitcoin enables transactions to be sent peer-to-peer without passing through a central authority. The transactions are recorded on a decentralized public ledger called the blockchain and each payment acquires a small transaction fee to cover the cost of the network. The total supply of Bitcoin is 21 million and it’s smallest unit of bitcoin is called a Satoshi, it’s a hundred millionth of a bitcoin – 0.00000001 BTC. The creation of Bitcoin’s is happening through mining. Miners have the task to validate transactions and keep the network secure. Their efforts are rewarded by new minted Bitcoins and transactions fees. Bitcoin can be exchanged for fiat or other cryptocurrencies, products and services. Over 100,000 merchants and vendors accepts bitcoin as a payment. 

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Ledger had aspirations to become a film director and had made some music videos with his production company The Masses, which director Todd Haynes praised highly in his tribute to Ledger upon accepting the ISP Robert Altman Award, which Ledger posthumously shared, on 23 February 2008.[36][30] In 2006, Ledger directed music videos for the title track on Australian hip hop artist N'fa's CD debut solo album Cause An Effect[37] and for the single "Seduction Is Evil (She's Hot)".[38][39] Later that year, Ledger inaugurated a new record label, The Masses Music, with singer Ben Harper and also directed a music video for Harper's song "Morning Yearning".[31][40]

In 2014, the company grew to one million users, acquired the blockchain explorer service Blockr and the web bookmarking company Kippt, secured insurance covering the value of bitcoin stored on their servers, and launched the vault system for secure bitcoin storage.[12][13][14] Throughout 2014, the company also formed partnerships with Overstock, Dell, Expedia, Dish Network, and Time Inc. allowing those firms to accept bitcoin payments.[15][16][17][18] The company also added bitcoin payment processing capabilities to the traditional payment companies Stripe, Braintree, and PayPal.[19]
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]

^ Daniel Kreps (29 February 2008). "Footage from Heath Ledger's Nick Drake Video Surfaces". Rolling Stone. Retrieved 18 March 2008. The video, for Drake's posthumously released song 'Black Eyed Dog,' was filmed by the actor in late 2007 and included in a multimedia instalment about Drake called 'A Place to Be.' The project was only screened publicly twice before the actor's death, and the Ledger family said the 'Black Eyed Dog' video would not be released.

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^ Boucher, Geoff; Gold, Matea; Lieberman, Paul (23 January 2008). "Ledger's death is a shock to Hollywood, fans". Los Angeles Times. Retrieved 2 April 2009. Minutes after the news of Ledger's death broke, several hundred people gathered outside the Broome Street apartment building where Ledger had been living ... television crews and area residents were joined by fans, including some Brooklyn acting students.

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