Magnet links has been introduced in [[BEP9 - Extension for Peers to Send Metadata Files]]. Here is a short summary with examples. Magnet link format: ``` v1: magnet:?xt=urn:btih:&dn=&tr=&x.pe= v2: magnet:?xt=urn:btmh:&dn=&tr=&x.pe= ``` BEP9 provides detailed description of all the fields. Here it is important to emphasize that only `xt` is mandatory. In particular for our purpose, in trackerless torrents, we may see in practice the magnet links having only the `xt` attribute. Other attributes, especially `x.pe` (peer address), may be used as well, but our discovery should not relay on any other attributes than `xt`. Tow examples of such a simplest magnet-links: **Version 1** ``` magnet:?xt=urn:btih:1902d602db8c350f4f6d809ed01eff32f030da95 ``` **Version 2** ``` magnet:?xt=urn:btmh:122003ee5d27d20f46c2395fb00e407a85f87c885e2e072d01f4e4bc516474203fe1 ``` **Hybrid** ``` magnet:?xt=urn:btmh:122003ee5d27d20f46c2395fb00e407a85f87c885e2e072d01f4e4bc516474203fe1&urn:btih:1902d602db8c350f4f6d809ed01eff32f030da95 ``` `122003ee5d27d20f46c2395fb00e407a85f87c885e2e072d01f4e4bc516474203fe1` is a SHA-256 multihash: ``` sha2-256/03ee5d27d20f46c2395fb00e407a85f87c885e2e072d01f4e4bc516474203fe1 ```