Not formal URNs for Magnet links, such hash sums are used by eDonkey2000 to restore and control the integrity of downloading and already downloaded files. xt=urn:ed2k: Advanced Intelligent Corruption Handler (AICH) Such hash sums consist of an SHA-1 Hash, followed by a TTH Hash, delimited by a point they are used on gnutella and G2 (Gnutella2). These hash sums are used on gnutella and G2 (Gnutella2). xt=urn:tree:tiger: Secure Hash Algorithm 1 (SHA-1)
These hashes are used on Direct Connect and G2 (Gnutella2), among others. "xt" ("exact topic"): the most important part of a Magnet link, this parameter is used to find and verify the specified files.
tr (address TRacker) – Tracker URL for BitTorrent downloads. mt (Manifest Topic) – link to the metafile that contains a list of magneto (MAGMA – MAGnet MAnifest). kt (Keyword Topic) – Key words for search. as (Acceptable Source) – Web link to the file online. xt (eXact Topic) – URN containing file hash. magnet:? xl = & dn = & xt = urn: tree: tiger: Parameters Magnet URIs can contain multiple parameters, in any order, separated from each other by '&'. to the parameter name, e.g.: magnet:?xt.1=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C&xt.2=urn:sha1:TXGCZQTH26NL6OUQAJJPFALHG2LTGBC7 Design The standard also allows for multiple parameters of the same type to be used by appending ".1", ".2", etc. application-specific experimental parameters, which must begin "x.". "mt" ("manifest topic"): a URI pointing to a "manifest", e.g. "kt" ("keyword topic"): a more general search, specifying search terms, rather than a particular file. "dn" ("display name"): a filename to display to the user, for convenience. Other parameters defined by the draft standard are: 
This makes them popular for use as "guaranteed" search terms within the file sharing community where anyone can distribute a magnet link to ensure that the resource retrieved by that link is the one intended, regardless of how it is retrieved.
Advanced Intelligent Corruption Handler (AICH)Īlthough magnet links can be used in a number of contexts, they are particularly useful in peer-to-peer file sharing networks because they allow resources to be referred to without the need for a continuously available host, and can be generated by anyone who already has the file, without the need for a central authority to issue them. The Magnet URI scheme, defines the format of magnet links, a de facto standard for identifying files by their content, via cryptographic hash value rather than by their location.
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