We made a block chain that uses interactive proof of work. Complete an interactive experience to produce a proof of work. For example, play a level of a computer game. Almost any game can be adapted to produce interactive proof of work. Produce proofs to earn Ecoin. All valid proofs are rewarded.

First game:
https://www.ecoinblockchain.info/match-three-tile-matching-game

White Paper:
https://ecoin.neocities.org/white-paper/