I found this http://www.righto.com/2014/02/ascii-bernanke-wikileaks-photographs.html#ref13 article.

It describes some techniques to upload/download data from blockchain, but the scripts referred are not working.
I know the default to upload custom data is op_return but i want to try multisig too.

https://gist.github.com/shirriff/64f48fa09a61b56ffcf9#file-bitcoin-file-downloader-py
https://gist.github.com/shirriff/bfc4df70a02732493a28#file-bitcoin-insertion-tool-py

Anyone know how to modify these to work? they seem deprecated. I am willing to send a tip!