1 - The Bitcoin Core, beeing an open source software where people can contribute and make changes, isn't it and issue? I would like to know how the changes are made on the code? Anyone can access and make changes? Is necessary any approval? If yes, from who?
Bitcoin Core is developed on github here: https://github.com/bitcoin/bitcoin. If you want to contribute, you make a fork of the repository (which goes to your account), make your changes, and then open a Pull Request on Bitcoin Core's repo. Then other Core contributors review your code and indicate whether they support the change or not. If a lot of the reviewers think the change is something that they want in Core, the maintainers of the repo will merge the change and it will be a part of Bitcoin Core.2 - Is it possible to change the maximum supply of coins? For instance, instead of 21 million coins, from now on the community decides to supply the system with 42 millions. Is it possible?
Yes, but it requires a hard fork. It would require every single person running a Bitcoin node to update their software to accept that new rule.3 - Why do miners charge for verifying the transactions? Once they receive new bitcoins for each block that is mined, why is it necessary to charge?
Because the block subsidy will go to 0 over time (and it decreases very quickly). Transaction fees are to pay miners so that they keep mining in the future as the block subsidy goes to 0. Otherwise there would be no incentive to mine blocks.Caso queiram acompanhar a conversa:
https://bitcointalksearch.org/topic/m.18992937
Obrigado!
