BitTorrent consumes 12% of total Internet traffic in North America and 36% of total traffic in the Asia-Pacific region, according to a 2012 study. It's so popular that the new 'Copyright Alert System' targets BitTorrent traffic alone.
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Jan 12, 2013 The answer to 'Using info hash to download files' is. The infohash is a MD5 schecksum used to verify the the file(s) are the correct ones and have not been altered since the hash. QBittorrent: how to add a torrent using it's hash? Ask Question. Urn:btih:INFOHASH (where the INFOHASH is the hash number) But the hash appear like 0000000. Any idea how to add a torrent from the hash? Share| improve this. You must need trackers for a torrent to be downloaded in magnet link here is an api which.
BitTorrent may be popularly known as a method of piracy, but it isn't just for pirates. It's a useful, decentralized peer-to-peer protocol with significant advantages over other protocols in many situations.
This article will help you understand how the BitTorrent protocol works and why it's not just a tool for piracy. We've previously explained how to get started with BitTorrent.
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How BitTorrent Works
When you download a web page like this one, your computer connects to the web server and downloads the data directly from that server. Each computer that downloads the data downloads it from the web page's central server. This is how much of the traffic on the web works.
How BitTorrent Works
When you download a web page like this one, your computer connects to the web server and downloads the data directly from that server. Each computer that downloads the data downloads it from the web page's central server. This is how much of the traffic on the web works.
BitTorrent is a peer-to-peer protocol, which means that the computers in a BitTorrent 'swarm' (a group of computers downloading and uploading the same torrent) transfer data between each other without the need for a central server.
Traditionally, a computer joins a BitTorrent swarm by loading a .torrent file into a BitTorrent client. The BitTorrent client contacts a 'tracker' specified in the .torrent file. The tracker is a special server that keeps track of the connected computers. The tracker shares their IP addresses with other BitTorrent clients in the swarm, allowing them to connect to each other.
Once connected, a BitTorrent client downloads bits of the files in the torrent in small pieces, downloading all the data it can get. Once the BitTorrent client has some data, it can then begin to upload that data to other BitTorrent clients in the swarm. In this way, everyone downloading a torrent is also uploading the same torrent. This speeds up everyone's download speed. If 10,000 people are downloading the same file, it doesn't put a lot of stress on a central server. Instead, each downloader contributes upload bandwidth to other downloaders, ensuring the torrent stays fast.
Importantly, BitTorrent clients never actually download files from the tracker itself. The tracker participates in the torrent only by keeping track of the BitTorrent clients connected to the swarm, not actually by downloading or uploading data.
Leechers and Seeders
Users downloading from a BitTorrent swarm are commonly referred to as 'leechers' or 'peers'. Users that remain connected to a BitTorrent swarm even after they've downloaded the complete file, contributing more of their upload bandwidth so other people can continue to download the file, are referred to as 'seeders'. For a torrent to be downloadable, one seeder – who has a complete copy of all the files in the torrent – must initially join the swarm so other users can download the data. If a torrent has no seeders, it won't be possible to download – no connected user has the complete file.
BitTorrent clients reward other clients who upload, preferring to send data to clients who contribute more upload bandwidth rather than sending data to clients who upload at a very slow speed. This speeds up download times for the swarm as a whole and rewards users who contribute more upload bandwidth.
Torrent Trackers and Trackerless Torrents
In recent times, a decentralized 'trackerless' torrent system allows BitTorrent clients to communicate among each other without the need for any central servers. BitTorrent clients use distributed hash table (DHT) technology for this, with each BitTorrent client functioning as a DHT node. When you add a torrent using a 'magnet link', the DHT node contacts nearby nodes and those other nodes contact other nodes until they locate the information about the torrent.
As the DHT protocol specification says, 'In effect, each peer becomes a tracker.' This means that BitTorrent clients no longer need a central server managing a swarm. Instead, BitTorrent becomes a fully decentralized peer-to-peer file transfer system.
DHT can also work alongside traditional trackers. For example, a torrent can use both DHT and a traditional tracker, which will provide redundancy in case the tracker fails.
BitTorrent Isn't Just For Piracy
BitTorrent isn't synonymous with piracy. Blizzard uses a custom BitTorrent client to distribute updates for its games, including World of Warcraft, StarCraft II, and Diablo 3. This helps speed up downloads for everyone by allowing people to share their upload bandwidth with others, leveraging unused bandwidth towards faster downloads for everyone. Of course, it also saves Blizzard money on their bandwidth bills.
People can use BitTorrent to distribute large files to significant numbers of people without paying for the web hosting bandwidth. A free film, music album, or game could be hosted on BitTorrent, allowing an easy, free method of distribution where the people downloading the file also help distribute it. WikiLeaks distributed data via BitTorrent, taking a significant load off their servers. Linux distributions use BitTorrent to help distribute their ISO disc images.
BitTorrent, Inc. – a company responsible for developing BitTorrent as a protocol, who also purchased and develop the popular µTorrent torrent client – is developing a variety of applications that use the BitTorrent protocol for new things via their BitTorrent Labs project. Labs experiments include a syncing application that securely synchronizes files between several computers by transferring the files directly via BitTorrent, and a BitTorrent Live experiment that uses the BitTorrent protocol to help broadcast live, streaming video, leveraging the power of BitTorrent to stream live video to large numbers of people without the current bandwidth requirements.
BitTorrent may be primarily used for piracy at the moment, as its decentralized and peer-to-peer nature are a direct response to efforts to crack down on Napster and other peer-to-peer networks with central points of failure. However, BitTorrent is a tool with legitimate uses in the present — and many other potential uses in the future.
Image Credit: Header Image by jacobian, central server and peer-to-peer network diagrams by Mauro Bieg on Wikipedia
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i am reading lately a lot about hash from torrents an magnetic links etc.
but there is a question i dont understand.
I have the hash of a file and the infohash of a torrent, is the infohash = hash of the file ?
If yes what if the torrent descripes 6 Files to download ?
If no what does it stand for.
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1 Answer
So I finally figured it out.
The 'infohash' is the SHA1 Hash over the part of a torrent file that includes:
- ITEM: length(size) and path (path with filename)
- Name: The name to search for
- Piece length: The length(size) of a single piece
- Pieces: SHA1 Hash of EVERY piece of this torrent
- Private: flag for restricted access
To show this a little more I took a random torrent file and used the 'BEncode Editor' from Ultima to make it more clearly to me.
As you can see the the red box marked the information part of the torrent file.The torrent file includes not the Hash of the items, but the hashes of every piece.
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- For item1 with: 1069496548
- and item2 with: 223
- It is together: 1069496771
- With a piece size of: 524288
- There are 2040 pieces. (1069496771/524288=2039.9032 approximately)
- The pieces section includes 40800 byte of data what are 81600 + 2 chars in the file.
- the +2 because 0x marks that this is hexadecimal.
- A SHA1 hash has 40 0x chars or 20 Byte of data what are 2040 SHA1 hashes.
I am sorry that this information is about a torrent that leads to a illegal movie, but i wanted to use a torrent that realy exists.
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