  By comparing cryptocurrencies with other existing payment methods, including
banknotes and bank cards, it is clear that the use of Bitcoin and its
competitors (Ethereum, \dots) is almost insignificant in world trade. We may
also note that these cryptocurrencies have become tools of speculation, which
is the antithesis of their primary purpose.
  Based essentially on the security of electronic signatures, the Ecash
introduced here will put the users back to the center of the game and exclude
miners and their enormous waste of power energy. Thus, the purpose of this
paper is to show that even a piece of paper can be recycled into a secure
Ecash, while remaining environmentally friendly. Hence, we create here a
cryptocurrency that would use a slight modification of the current banknotes to
set up anonymous electronic transactions. By trading with banknotes, we
mechanically transfer ownership of the paper money from one owner to another,
hence, in this scheme, we introduce the notion of ownership transfer. It
implies that at each transaction the elements allowing to authenticate the
Ecash does not change, while the ownership certificate will change since the
Ecash is transfer towards someone else.
