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Additional metadata is added to each file did: the merkle root and piece layers used by the bittorrent v2 format. This way, we can reconstruct the .torrent files from this data, allowing us to transfer files directly between RSEs using bittorrent clients running on each of the RSEs. This, initial implementation, relies on the qBittorrent client, but other clients which support bittorrent v2 could be added later. A new RSE protocol was needed for the task. The protocol must be configured with the hostname+port of the bittorrent's data channel and the 'magnet' scheme. We use custom extensions to the magnet format to store the name/scope/path of a replica, so the link is not currently importable into existing torrent clients, but this leaves the door open for the future. It would be possible to generate magnet links which actually work with such clients directly in list-replicas.
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