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Source: <a href="https://www.peercoin.net/blog/perpera-protocol/" rel="noopener noreferrer nofollow">Peercoin Blog, Feb 19, 2020</a><h3 id="perpera-data-audit-protocol">Perpera: Data Audit Protocol</h3>Perpera is an implementation of the <a href="https://github.com/PeerAssets/peerassets-rfcs/blob/master/0009-data-audit.md" rel="noopener noreferrer nofollow">PeerAssets DataAudit protocol</a> which was first presented as an PeerAssets RFC in June 2018. Perpera is a library written in TypeScript and aims to cater to the needs of future web-based applications and development/power user-focused CLI tools.The main purpose of this protocol is the embedding of arbitrary documents into the blockchain (proof-of-existence) and the ability to revise said documents. In this aspect (support for revisions), this protocol is different than similar protocols that are already in use.More on the PeerAssets DataAudit protocol:<blockquote>The primary purpose of this protocol is to record cryptographic hashes of successive revisions of single-file documents in a public blockchain, in a manner which enables thin clients to easily query and verify document histories. Such histories inherit useful properties from the underlying blockchain, namely immutability and massive replication, and can therefore serve as proofs of existence. In addition to cryptographic hashes, users may also record a collection of URLs for each document, facilitating retrieval of document contents from off-chain sources (IPFS, https, torrent). The goal is to impose minimal requirements on the blockchain, in terms of both features and storage space.</blockquote>Perpera was first introduced to the community back in 2019 via the perpera.peercoin.net web app.<img src="https://academy-public.coinmarketcap.com/optimized-uploads/67e4e03ccf544ab69efbd2a08f4a4faf.png" />The app is designed to be user-friendly and non-obtrusive. Future upgrades will feature integration with hardware wallets like Ledger Nano and Trezor T so that users do not have to worry about the key management.Recently, Perpera has been implemented as a plugin for popular Nextcloud self-hosting file service.<img src="https://academy-public.coinmarketcap.com/optimized-uploads/28db5e6c94384c509fbe72c26d0a22cb.png" />Code (BSD-3) and install instructions can be found here: <a href="https://github.com/peercoin/perpera-nextcloud" rel="noopener noreferrer nofollow">https://github.com/peercoin/perpera-nextcloud</a>

Perpera Protocol

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