I just understand a little of Portuguese. I Only know Spanish and English.
Alberto, eu estava mesmo pensando nisso, sobre eu mesmo minerar o bloco, mas dai daria mais trabalho, pelo hashrate necessário.
Mas dai a minha dúvida.
Supondo que tivesse poder pra minerar, o processo não seria:
1 - Colocar a transação na mempool;
2 - Minerar o bloco?
It is not necessary to broadcast the transaction before mining the block.
Once that miners found a valid hash for their private block, they need to broadcast their full block data, only at that time the transaction will be public. (We are talking of private transactions that are only public once that they are already inside of a mined block).
You need to learn the full mining process, you need to know about the merkle trees and how block headers need to be build:
https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch12_mining.adoc#constructing-the-block-header