Code no longer works with current package.json

[pauloguimaraes]

The current version of code actually does not work. ):
The issue is related with the Elliptic version required in package.json.

The npm install command will try to install "^6.4.0" Elliptic version, which refers now to the 6.4.1 version. This Elliptics version have some different methods call, implying that the code no longer compile.

One alternative is require the specific Elliptic version, e.g.:
"elliptic":"6.4.0"