It included EIP-649: Metropolis Difficulty Bomb Delay and Block Reward Reduction, where the Ice Age (see below) was delayed by 1 year and the block reward was reduced from 5 to 3 ether. The first of two hard forks for the Metropolis development stage.
Another software client to increase Bitcoin's block size limit per hard fork, Bitcoin Unlimited gained traction among Bitcoin's mining community. Endorsed by Bitmain's Wu in particular, the project appeared to be heading toward a potential (and controversial) hard fork. Meanwhile, the block size debate raged on.
Several months later, an even bigger group of Bitcoin
Core contributors and mining pool operators met in California. The Bitcoin Core contributors present at this meeting left convinced that Segregated Witness would be activated by the miners.
Private keys are stored encrypted in a state of the art storage medium called FRAM that has full data retention for over 200 years (at +35°C) and is not affected by magnetic fields. BC Vault gives you full control of your private keys. Encrypt, Export, Erase.
At the same time that SegWit was being developed, block size tensions in the Bitcoin community were once again heating up. This time spearheaded by Bitcoin Classic, a number of Bitcoin companies and miners appeared determined to hard fork in order to increase the block size limit to 2 megabytes.
It is available at https://github.com/lightningnetwork/lightning-rfc. BOLT, or Basis Of Lightning Technology, is the formal specification of the Lightning Network protocol. Unlike Bitcoin, which has a reference implementation that also serves as the protocol’s specification the various Lightning Network implementations follow BOLT so they can work with one another to form the same network.
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These coins relied on the same miners as Bitcoin, to a large extent, and most were not signaling support for the upgrade. Litecoin, Vertcoin and Viacoin all seemed to have been caught in Bitcoin's political game. But other coins were struggling.
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In July 2017, a vulnerability in the Parity wallet contract caused the loss of US $ 31M . However, supporting rich applications makes Ethereum have a large vulnerability surface, as evidenced by the many high-profile attacks. In April 2018, the MyEtherWallet wallet fell victim to a BGP and DNS hijacking attack, enabling the hacker to steal US $ 17M . This should not be taken as a surprise, because Ethereum is a new programming paradigm with DApps running on top of blockchains with many autonomous contracts. These attacks highlight that our capabilities in securing the Ethereum system are limited. One example is the DAO attack  in 2016, where an attacker exploited the reentrancy vulnerability (which will be detailed later) to steal about US $ 60M.
When an +assert()+ statement fails, something very wrong and unexpected is happening, and you will need to fix your code. You should use +assert()+ to avoid conditions that should never, ever occur. In Solidity, +assert(false)+ compiles to 0xfe , an invalid opcode, which uses up all remaining gas and reverts all changes.
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A set of proposals that members of the Bitcoin
community have submitted to improve Bitcoin. For example, BIP-21 is a proposal to improve the Bitcoin uniform resource identifier (URI) scheme. Bitcoin Improvement Proposals.