MultiSigAddress.org is an
OPEN SOURCE bitcoin paper wallet generator. This site uses
buidl.js an easy to use layer on top of the
BitcoinJS library.
All of the functions on this page can be ran offline, by
saving this site and running the
index.html file.
This repository also contains a UTXO selecting transaction builder
multisig-build.html, and offline key signor
multisig-sign.html.
You can enable testnet mode by adding
?testnet=true to the end of the url.