Mining is the process of securing each block to the existing blockchain. Miners can inject these units directly back into the market. Once a block is secured, new units of cryptocurrency known as ‘block rewards’ get released. Due to their crucial role in the process, btc miners can exert significant control over bitcoin
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How it activated is a long story. While it was first publicly proposed and included in the Bitcoin Core roadmap in December 2015, and the code was ready less than a year later, bitcoin it took until the summer of 2017 for the protocol upgrade to go live.
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(Soft fork upgrades require support from only a majority of hash power to avoid a split of the network, while hard forks require network-wide consensus.) Last but not least, all of this was made possible without requiring a backward-incompatible hard fork protocol upgrade.
Before SegWit, an oddity about Bitcoin’s cryptographic signatures made it such that transactions could be tweaked to "look" different, even by people who hadn’t themselves created the transaction. As probably its most notable fix, SegWit got rid of transaction malleability. While this wouldn’t make the transaction invalid or change what it did — it would still send the same amount of coins from the same addresses to the same addresses — it severely complicated the deployment of layer two protocols like the Lightning Network.
It's a level of growth unheard of in traditional investing markets. Over the past year, Bitcoin's price has gone up more than 900 percent. Now, banks, governments, and everyday people are wondering if Bitcoin is the future of money, a giant bubble ready to pop or something in between.
(Case in point: SegWit has been live for years, and no miners have been able to steal any coins.) Some of the other controversies surrounding SegWit — some, for example, claimed it would allow miners to steal funds — are simply hogwash.
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Nonetheless, there are several other factors which can influence bitcoin prices, and these should be kept in mind by traders. Its characteristics more closely resemble commodities rather than conventional currencies. This is because it’s beyond the direct influence of a single economy and is largely unaffected by monetary policy changes. Primarily, bitcoin is now used as a form of investment.
They would have preferred different scaling solutions or more scaling solutions. They may even be trying to drive up transaction fees on Bitcoin in order to incentivize users to migrate to altcoins. The second reason would be "political": Some people suspect that certain companies aren’t upgrading to SegWit as a sort of protest.
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The only point of controversy that (arguably) had some validity to it is that it would have been "cleaner," code-wise, to deploy the upgrade as a hard fork instead of a soft fork, as this would leave less technical doubt in the protocol. Deploying SegWit as a hard fork would have had its own problems, however, which most developers and proponents of SegWit believed would have been much greater.