#Bitcoin in a tiny nutshell:

Numbered blocks of data containing money transactions, and added over time in series, with each block containing the hash of the previous block, and each hash required to be within a prespecified and range that adusts to frequency of production where new supply of money is produced within each block, distributed predictably over time, and tapers down over a period of 131 years, capping the supply to 21 million coins.

There's so much more to it, but that's my technical nutshell.