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specification
Horizen is an implementation of the Zerocash cryptographic protocol operating over a block chain provided by a fork of the Bitcoin source code. Sitting between the two is the Horizen protocol itself.
Zerocash is a peer-reviewed cryptographic protocol providing decentralized anonymous e-cash on top of a block chain. The details of this protocol, along with a proof of security, can be found at http://zerocash-project.org/paper.
Horizen if a fork of Zcash and the Zcash protocol spec is valid for it as well with one notable exception, Horizen implements BIP-115 replay protection.
https://github.com/bitcoin/bips/blob/master/bip-0115.mediawiki https://github.com/zcash/zips/blob/master/protocol/protocol.pdf
The details of how to integrate the Zerocash cryptographic scheme into a Bitcoin consensus protocol are crucial to overall usability, security, and performance. Horizen includes important security fixes and functionality enhancements relative to Zerocash, as well as a new proof of work.
https://bitcoin.org/en/developer-reference
Horizen is based on Bitcoin, so much of the underlying consensus protocol is the same.
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