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# Linearize
Construct a linear, no-fork, best version of the Bitcoin blockchain.
## Step 1: Download hash list
$ ./linearize-hashes.py linearize.cfg > hashlist.txt
Required configuration file settings for linearize-hashes:
* RPC: `rpcuser`, `rpcpassword`
Optional config file setting for linearize-hashes:
* RPC: `host`, `port` (Default: `127.0.0.1:8332`)
* Blockchain: `min_height`, `max_height`
* `rev_hash_bytes`: If true, the written block hash list will be
byte-reversed. (In other words, the hash returned by getblockhash will have its
bytes reversed.) False by default. Intended for generation of
standalone hash lists but safe to use with linearize-data.py, which will output
the same data no matter which byte format is chosen.
## Step 2: Copy local block data
$ ./linearize-data.py linearize.cfg
Required configuration file settings:
* `output_file`: The file that will contain the final blockchain.
or
* `output`: Output directory for linearized blocks/blkNNNNN.dat output.
Optional config file setting for linearize-data:
* `file_timestamp`: Set each file's last-modified time to that of the most
recent block in that file.
* `genesis`: The hash of the genesis block in the blockchain.
* `input: bitcoind blocks/ directory containing blkNNNNN.dat
* `hashlist`: text file containing list of block hashes created by
linearize-hashes.py.
* `max_out_sz`: Maximum size for files created by the `output_file` option.
(Default: `1000*1000*1000 bytes`)
* `netmagic`: Network magic number.
* `rev_hash_bytes`: If true, the block hash list written by linearize-hashes.py
will be byte-reversed when read by linearize-data.py. See the linearize-hashes
entry for more information.
* `split_timestamp`: Split blockchain files when a new month is first seen, in
addition to reaching a maximum file size (`max_out_sz`).
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