Proof of Elapsed Time (POET) Summary [Cryptocurrency consensus mechanisms]

In this poetically named consensus mechanism, network participants prove that they have slept for a random amount of time before being able to mint a block.

POET was released by Intel in 2016 and was originally aimed at trusted computing using Intel CPU's. A special instruction set called Software Guard Extensions (SGX) allows programs to run under a trusted environment (cryptographically signed).

When a node joins a POET network, it downloads some executable content from a public blockchain. This content is then run, generating this node's private keys.

The content received from the blockchain is used to generate a random number, often called a timer object. This random timer object tells the node how long it must wait before waking up again.

Once the POET node wakes up it mints a block and sends it into the network. The block which reaches most participants is accepted, all others discarded.

This looks a lot like Bitcoin's Proof of Work (PoW) system - and it is!

While Bitcoin's PoW system forces a wait using brute force (a difficult to solve cryptographic puzzle), POET forces a wait through trusted computing.

Programmers would call Bitcoin's system a busy wait system, whereas POET is a lazy algorithm. Bitcoin's proof of work spends massive amounts of energy during the wait period and POET does not.


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On Security Analysis of Proof-of-Elapsed-Time (PoET)

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