Single-page html file (based on BitCore) for signing a document using a Bitcoin private key.
This was commissioned by the Ledger Journal in 2015 for authors to sign their published manuscripts. The file can also be found at http://www.ledgerjournal.org/ojs/public/journals/1/simplesign.html but is included here for the sake of authenticity.
$ sha256sum simplesign.html
b792e4c7e7ac97acaa8464c449cf25a745c465aa09dd275fec41b0756dd430cc simplesign.html
Archive.org link: https://web.archive.org/web/20170104195233id_/http://www.ledgerjournal.org/ojs/public/journals/1/simplesign.html