Creating my own bootstrap.dat?
Bitcoin Core contains a tool to do this properly (filtering out any orphan blocks, putting everything in the correct order — which will work a lot better than just concatenating the block files. It's documented in its own README, here: https://github.com/bitcoin/bitcoin/tree/master/contrib/linearize

In short:


Launch Bitcoin with an rpcuser and rpcpassword set in your config file, with the correct location as per https://en.bitcoin.it/wiki/Running_Bitcoin#Bitcoin.conf_Configuration_File
Checkout the Bitcoin source from Github and cd to contrib/linearize.
Copy example-linearize.cfg to linearize.cfg and update it with your rpcuser/rpcpassword values, along with the maximum block height you want to output (max_height), and the path to your data directory (input), as well as the path to your desired output file (output_file).
Run ./linearize-hashes.py linearize.cfg &gt; hashlist.txt followed by ./linearize-data.py linearize.cfg.