Forum How to get free space for uploading pictures and documents? Dropbox

Dropbox: Your Digital Workspace Dropbox is one of the most popular cloud storage services. Simply put, it is an "online flash drive" or a digital vault on the internet. Here are the main reasons why millions of people use it: File Storage and Accessibility: You can upload photos, videos, documents, or any other files to Dropbox. Once uploaded, you can access them from any device (phone, computer, tablet) with an internet connection. Synchronization: If you drop a file into the Dropbox folder on your computer, it instantly appears on your phone as well. You no longer need to transfer files via cables or email them to yourself. File Sharing: You can share large files or folders with anyone using a simple link, even if they don't have a Dropbox account themselves. Collaboration: You can grant friends or colleagues access to a specific file and work on it together in real-time. Security and Backup: If your computer or phone breaks, you won’t lose your files uploaded t...

Forum How does Bitcoin works?



The basics for a new user

As a new user, you can get started with Bitcoin without understanding the technical details. Once you've installed a Bitcoin wallet on your computer or mobile phone, it will generate your first Bitcoin address and you can create more whenever you need one. You can disclose your addresses to your friends so that they can pay you or vice versa. In fact, this is pretty similar to how email works, except that Bitcoin addresses should be used only once.

Balances - block chain

The block chain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the block chain. It allows Bitcoin wallets to calculate their spendable balance so that new transactions can be verified thereby ensuring they're actually owned by the spender. The integrity and the chronological order of the block chain are enforced with cryptography.

Transactions - private keys

A transaction is a transfer of value between Bitcoin wallets that gets included in the block chain. Bitcoin wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet. The signature also prevents the transaction from being altered by anybody once it has been issued. All transactions are broadcast to the network and usually begin to be confirmed within 10-20 minutes, through a process called mining.


Processing - mining

Mining is a distributed consensus system that is used to confirm pending transactions by including them in the block chain. It enforces a chronological order in the block chain, protects the neutrality of the network, and allows different computers to agree on the state of the system. To be confirmed, transactions must be packed in a block that fits very strict cryptographic rules that will be verified by the network. These rules prevent previous blocks from being modified because doing so would invalidate all the subsequent blocks. Mining also creates the equivalent of a competitive lottery that prevents any individual from easily adding new blocks consecutively to the block chain. In this way, no group or individuals can control what is included in the block chain or replace parts of the block chain to roll back their own spends.


Going down the rabbit hole

This is just a short summary of Bitcoin. If you want to learn more of the details, you can read the original paper that describes its design, the developer documentation, or explore the Bitcoin wiki.

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