  We lay the foundations for a blockchain scheme, whose consensus is reached
via a proof of work algorithm based on the solution of consecutive discrete
logarithm problems over the point group of elliptic curves. In the considered
architecture, the curves are pseudorandomly determined by block creators,
chosen to be cryptographically secure and changed every epoch. Given the
current state of the chain and a prescribed set of transactions, the curve
selection is fully rigid, therefore trust is needed neither in miners nor in
the scheme proposers.
