Fairblock

Read more Fairblock’s vision here
Read more about Fairblock’s cryptography here

Fairblock consists of: 

• The Fairblock SDK –  A framework that developers can use as part of the building blocks of their applications and networks to take advantage of the privacy-preserving services offered by the Fairblock Network.
• FairyRing – A Cosmos SDK appchain mainly responsible for decentralized generation of private keys for decryption of transactions generated across the apps and networks that have integrated Fairblock, triggered upon specific conditions.

The highly simplified flow of our approach is as follows:

a. From the frontend of an app that has integrated Fairblock, a user encrypts a transaction(s) using a master public key and declares the transaction’s “condition(s) for decryption.” Example of “conditions” are the execution of a transaction at a specific time in the future, when certain market conditions are reached, or at the conclusion of a voting period. The encrypted transaction(s) is submitted on-chain on the network where the application resides.

b. The validators or sequencers of the underlying network include the encrypted transaction(s) in a block.

c. Once the condition(s) for decryption are met, validators of the FairyRing submit private key shares. The key shares are aggregated to form a private key matching the master public key associated with the encrypted transaction(s) and the condition of decryption.

d. The aggregated private key is used to decrypt the encrypted transaction(s), which are thereafter executed by the validators of the network upon which the app resides.

Using this approach, Fairblock provides developers with the freedom to choose when, where, and how to implement encrypted transactions into decentralized applications. This can be useful to protect users from various forms of malicious strategies from adversaries, promoting fairness across the crypto ecosystem.