Bitcoin docs, broken statements

[andrea-dintino]

This page: https://github.com/dyne/Zenroom/blob/master/docs/pages/zencode-scenarios-bitcoin.md

Contains this link:

which contains some outdate Zencode. The cookbook scripts should be reviewed, if outdated their output files should be produced by the new test scripts.

[jaromil]

This tutorial should work

https://news.dyne.org/bitcoin-secure-off-line-wallet/

else please point out at what point it breaks