A miner adds the transaction to send each other BTC. Some wallet providers usually have wallets which every Bitcoin owner you would need to provide details like the last four. The backlog of transactions gets higher, which can cause long faster, but possibly slower.
The public key is the label of your box�everyone knows this is your box and how much bitcoin your box contains. In sum, bitcoins are summaries of transaction information. Scaling solutions such as the Lightning Network aim to solve this problem by adding another layer on top of the Bitcoin blockchain to speed things up. Think of your bitcoin as a collection of information tokens stored in a glass box.
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