[wraithm112]

> Innovation of bitcoin is proof of work, not a chain of blocks.

Proof of work was invented in the late 90s by Adam Back. The consensus algorithm using proof of work and a blockchain is what Bitcoin brought to the world.

[onnoonno]

> Proof of work was invented in the late 90s by Adam Back. The consensus algorithm using proof of work and a blockchain is what Bitcoin brought to the world.

Wikipedia disagrees:

> The concept may have been first presented by Cynthia Dwork and Moni Naor in a 1993 journal article.

Adam Back invented hash cash as one form of POW.

[wraithm112]

True, I was wrong. Thank you for the correction.

[brighton36]

Adam would say that the difficulty calibration was the innovation satoshi brought, as most everything else existed elsewhere in some capacity