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Hyperledger Sawtooth is another general-purpose blockchain framework under Hyperledger Umbrella for building both distributed ledgers:
While Fabric is a permissioned blockchain, Sawtooth supports both permissioned and permissionless blockchains. Permissions are set at both the network level and the local validator configuration level:
Unlike other private blockchains such as Hyperledger Fabric, Corda, or Quorum, where a sensitive or private transaction may not be accessible to all nodes, all transactions in Sawtooth are stored in validators in the network; it relies on the local permissions to enforce transaction privacy.
The consensus in Sawtooth, by design, is pluggable too. Consensus algorithms can be configured at the network level during the initial validator network's setup. They can be switched during the transaction process too. By default, it supports the Proof of Elapsed Time (PoEt) consensus protocol, although a voting-based consensus in RAFT is under development. PoET is a Nakamoto-style lottery-based consensus algorithm that relies on Intel's Software Guard Extensions (SGX) to select a validator to create blocks based on random waiting times, without using the PoW algorithm.
If you like to explore more private distributed ledger platforms, reading the below articles is highly recommended:
This article is written in collaboration with Brian Wu who is a leading author of “Learn Ethereum: Build your own decentralized applications with Ethereum and smart contracts” book. He has written 7 books on blockchain development.
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If you like to learn more about blockchain technology and how it works, reading the following articles is highly recommended:
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