> For the complete documentation index, see [llms.txt](https://tokens-economy.gitbook.io/consensus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tokens-economy.gitbook.io/consensus/chain-based-proof-of-capacity-space/proof-of-proof-pop.md).

# Proof of Proof (PoP)

The Proof of Proof™ consensus protocol enables blockchains to inherit proof-of-work security from other blockchains, creating an ecosystem wherein security originates on established blockchains like Bitcoin and extends to other blockchains. The PoP protocol introduces a new type of miner who performs periodic publications of one blockchain’s current state to another blockchain. These publications are referenced in the event of a potential blockchain reorganization. PoP requires a blockchain has some means of creating blocks, such as low-hashrate local PoW, PoS, etc.

## Used in

* [VeriBlock](https://www.veriblock.org)

## Read more

* [WhitePaper](https://raw.githubusercontent.com/cedricwalter/blockchain-consensus/master/whitepaper/PoP-Whitepaper.pdf)