Bitcoin
Transcript of Bitcoin
![Page 1: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/1.jpg)
Daniel Carneiro (@dcarneir)
![Page 2: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/2.jpg)
O que é
● Moeda virtual (?)● Não controlada por nenhum banco ou país● Peer-to-peer● Transações públicas com chaves anônimas● Polêmica
– Atividades ilícitas
– Roubos
– Expeculação financeira
![Page 3: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/3.jpg)
História
● 05/10/2009 – Satoshi Nakamoto● 17/07/2010 – Mt.Gox● 06/09/2010 – Casascius Coins● 01/01/2011 – Silk Road● 21/08/2013 – Alemanha reconhece como
private money● 05/12/2013 – China proíbe bancos● 09/03/2014 – MtGox pede concordata
![Page 4: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/4.jpg)
Cotação
● 22/05/2010 – 10,000 BTC = 1 Pizza● 09/02/2011 – 1 BTC = 1 USD● 02/06/2011 – 1 BTC = 10 USD● 01/04/2013 – 1 BTC = 100 USD● 17/11/2013 – 1 BTC = 500 USD● 19/11/2013 – 1 BTC = 1,200 USD● 17/12/2013 – 1 BTC = 500 USD
![Page 5: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/5.jpg)
Cotação
![Page 6: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/6.jpg)
Chave
● Chave privada● Endereço
– 1NtWdrQDhg17eNriA8Hb9uMW6i5kwcfiSB
● Carteiras virtuais– Aplicativo
– Web
![Page 7: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/7.jpg)
Block Chain
● Registro de todas as transações● Blocos são ligados aos anteriores● Splits resolvidos por consenso● Confirmação com 6 blocos
![Page 8: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/8.jpg)
Mineração
● Processo de criação de bitcoins● Atualiza o blockchain● Proof of work● Performance (MHash/s)
– CPU – 22
– GPU – 500 ($300.00)
– FPGA – 100-6,000 ($150-$1000)
– ASIC – 4,000-2,000,000 ($50-$1,500)
![Page 9: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/9.jpg)
AltCoins
● Sha256– Namecoin
● scrypt– LiteCoin
– DogeCoin
● Outros– Primecoin
● …
![Page 10: Bitcoin](https://reader035.fdocuments.net/reader035/viewer/2022081821/55ad6b331a28ab433d8b458f/html5/thumbnails/10.jpg)
Obrigado
● http://historyofbitcoin.org/● http://en.wikipedia.org/wiki/History_of_Bitcoin● https://en.bitcoin.it