# PoAge Is Trustless

### Canopy's Proof-of-Age

Canopy introduces a unique mechanism to allow trustless syncing of the blockchain:

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Verifiable-Delay-Functions are a cryptographic primitive that requires the execution of sequential work that is fundamentally resistant to hardware speedups.
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In other words...VDFs are a reliable proxy for elapsed time. This enables Canopy to reliably utilize a fork-choice rule of the oldest (age) chain, allowing a syncing node **strong subjectivity** when choosing between two forks.

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TL;DR: Like PoW — Proof-of-Age enables trustless syncing, but without the energy costs!
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### <mark style="color:blue;">The Result: NestBFT</mark>

NestBFT uses Proof-of-Stake for:

* Energy-efficient consensus
* Simple and self-reinforcing 'sybil attack' protection
* Instant finality with 20-second blocks
* Economic stability via bonding&#x20;

... and Proof-of-Age for:

* Verifiable mitigation of Long-Range-Attacks
* An additional layer of security against emerging threats
* Extending security to Nested Chains by offering decentralized Checkpointing-As-A-Service

The combination of the two ensures NestBFT is fundamentally more trustless than legacy PoS systems.

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Since trust is involved with Ethereum's Gasper and Tendermint's BFT, how much of Web3 is truly trustless?
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Read the full specification of [Canopy's Consensus](/docs/canopy-network/how-does-canopy-work/consensus.md)!


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