---
title: "How do you destroy something in a way that it can never be…"
date: 2016-10-28
source: facebook
type: Archer T. Ships shared a link.
---

# How do you destroy something in a way that it can never be…

*October 28, 2016 · Facebook*

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[https://z.cash/blog/the-design-of-the-ceremony.html](https://z.cash/blog/the-design-of-the-ceremony.html){target="_blank"}
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How do you destroy something in a way that it can never be reconstructed? How do you prove it? Turns out, it\'s a hard problem.\
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\"In order to reduce the risk of an attacker acquiring the toxic waste, we developed a Multi-Party Computation (MPC) protocol in which a set of multiple participants in separate geographic locations cooperatively construct the public key. Each participant separately generates one shard of the public key, which requires them to temporarily use a corresponding private key shard. They all combine their public key shards to generate the final public parameters, and then each deletes their private key shard.\
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With the MPC protocol, as long as at least one of the participants successfully deletes their private key shard, then the toxic waste is impossible for anyone to reconstruct. The only way the toxic waste can be reconstructed is if every participant in the protocol were dishonest or compromised.\"\
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[https://z.cash/blog/the-design-of-the-ceremony.html](https://z.cash/blog/the-design-of-the-ceremony.html){target="_blank"}
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