Topic: Em 9 anos de operação do bitcoin, jamais houve um caso de fraude no blockchain" (Read 197 times)

Em resumo, quer dizer que nunca alguem conseguiu burlar o sistema que o bitcoin funciona a ponto de conseguir fraudar, roubar, ganhar ou de alguma forma corromper o sistema.
Houve sim alguns problemas isolados, que foram corrigidos e tudo continuou bem, ate onde eu saiba, sem nenhuma perda.

Diferente de outras moedas ai que nao usam blockchain, como IOTA, que deixei meus fundos la e simplesmente me roubaram mesmo comprovadamente sem eu comprometer minha seed.

Teve um caso...

Eu lembro que li uma vez, mas como estava fora do mundo das criptos não dei muita importância.
Também tentei pesquisar agora mas acho que não esrtou usando os termos certos.

...em que a rede BTC (blockchain, ou sei lá o que foi) estava em uma "pane" temporária e só quem tinha um node completo estava conseguindo de fato verificar a integridade de uma transação.
Talvéz foi um problema do blockchain.info e não do blockchain do BTC. Como eu disse... isso faz tempo e eu tava por fora.

Talvez esteja confuso demais, mas alguém lembra de algo assim e poderia esclarecer?

11/12 March 2013 - Chain Fork Information
What happened: A bitcoin miner running version 0.8.0 created a large block (at height 225,430) that is incompatible with earlier versions of Bitcoin. The result was a block chain fork, with miners, merchants and users running the new version of bitcoin accepting, and building on, that block, and miners, merchants and users running older versions of bitcoin rejecting it and creating their own block chain.

What is being done:Large mining pools running version 0.8.0 were asked to switch back to version 0.7, to create a single block chain compatible with all bitcoin software.

Questions & Answers

I'm not a miner or a merchant, what should I do?
Nothing. Your bitcoin software will switch to the correct chain automatically, no matter which version you are running.

Are my bitcoins safe?
Yes.

What will be done
The core developers have investigated what caused the old versions to reject the new blocks, and have released a 0.8.1 version that avoids creating blocks that are incompatible with older versions. A full post-mortem document has been published.

Source1: https://bitcoin.org/en/alert/2013-03-11-chain-fork
Source2: http://bitcoinmagazine.com/3668/bitcoin-network-shaken-by-blockchain-fork/

8th August 2010 - 92 billion BTC into existence

On 8th August 2010 bitcoin developer Jeff Garzik wrote what could be mildly described as the biggest understatement since Apollo 13 told Houston: “We’ve had a problem here.”. “The ‘value out’ in this block is quite strange,” he wrote on bitcointalk.org, referring to a block that had somehow contained 92 billion BTC, which is precisely 91,979,000,000 more bitcoin than is ever supposed to exist. CVE-2010-5139 (CVE meaning ‘common vulnerability and exposures’) was frighteningly simple and exploited to the point of farce by an unknown attacker. In technical language, the bug is known as a number overflow error.So instead of the system counting up 98, 99, 100, 101, for example, it broke at 99 and went to zero (or -100) instead of 100. In layman’s terms, someone found a way to flood the code and create a ridiculously large amount of bitcoin in the process.

The fix was the bitcoin equivalent of dying in a video game and restarting from the last save point. The community simply hit ‘undo’, jumping back to the point in the blockchain before the hack occurred and starting anew from there; all of the transactions made after the bug was exploited – but before the fix was implemented – were effectively cancelled.

How serious was it? Bitcoin’s lead developer Wladimir Van Der Laan is pretty blunt about it, telling me: “It was the worst problem ever.”

Source1: http://www.coindesk.com/9-biggest-screwups-bitcoin-history/
Source2: https://bitcointalksearch.org/topic/strange-block-74638-822

Quando eu vejo esses artigos eles fazem parecer que o bitcoi  é uma espécie de órgão que processa as transações... Na verdade é que o bitcoin é matematicamente incorruptível, e se algum fraude ocorrer na blockchain, foi uma fraude de fora, e nao em alguma transação da rede.