UPDATE Feb 2013
: This thread is obsolete. See the non-beta Bitcoin blockchain data torrent
thread for further torrents and updates.
This is a beta test of a blockchain torrent project. Interested participants are invited to try, and comment.
Version 0.7.1, which just entered testing
, includes a new feature: If the file "bootstrap.dat" is found in the bitcoin data directory, it will validate and import all blockchain data found in that file. The following torrent presents a bootstrap.dat file for that feature.
Here is the PGP-signed torrent information. Details follow below the signature
-----BEGIN PGP SIGNED MESSAGE-----
Torrent info hash: 0bb0521942f586ed96203c6f4d136324756f8a9a
Torrent magnet link:
Byte size: 2491771562
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
-----END PGP SIGNATURE-----What is bootstrap.dat?
It is a flat, binary file containing bitcoin blockchain data, from the genesis block through height 193,000. Height 193,000 is the height of the current checkpoint baked into the reference client.
Version 0.7.1 (when released) will automatically validate and import a file in the data directory named "bootstrap.dat". Version 0.7 or later will also import this file by passing the command line argument "-loadblock=/path/to/bootstrap.dat" to bitcoin-qt or bitcoind.Who wants bootstrap.dat?
Anyone bringing up a new node using the reference client. This is one method of accelerating the initial blockchain download process, while helping the bitcoin P2P network by offloading data download traffic from public P2P nodes.
This download is not
for those who are already running the bitcoin client.NOTE: This torrent requires DHT torrent capability
This torrent is a so-called "trackerless torrent", to avoid making any of the open torrent trackers targets of any bitcoin antipathy. Peers for this torrent are discovered via DHT, and early results seem to indicate that some bittorrent clients take a while to find their initial peers. We have also discovered clients (rtorrent) that disable DHT by default; you will need to turn it on.
Please report results, good or bad, on using this trackerless torrent.How often will this torrent be updated?
Assuming this project is deemed useful and worth continuing... the torrent will be updated once every few months, when the checkpoints are updated in the reference client source code
.Why not update the torrent more often?
A torrent works best when it is a large, static dataset that changes infrequently. That maximizes the ability to seed the data, enabling even part-timer seeders to contribute meaningfully. Less frequent changes also minimizes the risk that a malicious torrent will appear, with a long, malicious side chain. The current policy only updates the torrent after blocks are buried many thousands deep in the chain.Why should I trust you?
You don't have to: This data is raw block chain data. The client will verify
this data during import.
Independent third parties may generate their own bootstrap.dat, up to height 193000, and verify that the sha256sum matches that posted above. The file format is simple and publicly known:
<4-byte pchMessageStart><32-bit length><CBlock, serialized in network wire format>Torrent file download?
If the magnet link does not work, download http://gtf.org/garzik/bitcoin/bootstrap.dat.torrentComments welcome
Post any comments or experiences in this thread. I'll update the OP as needed.
Maybe trackerless will be a #fail, but let's see how it goes.