Proof-of-Work

New Altcoin Promotes Fitness with 'Proof of Sweat'
Mangocoinz uses exercise as proof of work, but how to stop the cheaters?

5 Global Problems Bitcoin's Proof of Work Can Help Solve
Could there be better uses of cyrptocurrency proof of work rather than just solving arbitrary cryptographic problems?

Trust in Bitcoin builds by solving one 'puzzle' at a time
What makes Bitcoin transactions secure and trustworthy? Computer security and cryptography expert Zulfikar Ramzan explains in this video from Khan Academy.

