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Hyperledger Fabric is a permissioned blockchain infrastructure, originally contributed by IBM and Digital Asset, providing a modular architecture with a delineation of roles between the nodes in the infrastructure, execution of Smart Contracts (called "chaincode" in Fabric) and configurable consensus and membership services.
Because all early blockchains were permissionless, controversy has arisen over the blockchain definition. An issue in this ongoing debate is whether a private system with verifiers tasked and authorized (permissioned) by a central authority should be considered a blockchain.
Permissioned? [Note 1] Finality Ledger state Notes Refs. Bitcoin: January 3, 2009 Satoshi Nakamoto: BTC. PoW with Nakamoto Consensus Yes (scripts) No No Probabilistic UTXO: First and most well-known blockchain of all; BTC is the most valuable token in terms of market share. [1] [2] Litecoin: Oct 8, 2011 Charlie Lee LTC PoW: Yes (scripts) Yes [1 ...
Blockchain has been acknowledged as a way to solve fair information practices, a set of principles relating to privacy practices and concerns for users. [5] Blockchain transactions allow users to control their data through private and public keys, allowing them to own it. [5] Third-party intermediaries are not allowed to misuse and obtain data. [5]
Ethereum-based permissioned blockchain variants are used and being investigated for various projects: In 2017, JPMorgan Chase proposed developing JPM Coin on a permissioned-variant of Ethereum blockchain dubbed "Quorum". [87] It is "designed to toe the line between private and public in the realm of shuffling derivatives and payments.
L3COS (Level 3 Consensus Operating System) is an algorithm for digitising processes based on Blockchain, which has a three-level structure and is distributed as Platform as a Service for state bodies and businesses. The algorithm is based on the blockchain, in which any decision made at any of the levels will become part of the common chain.
[19] HB 2417 Act also provides a definition of blockchain technology as a "distributed, decentralized, shared and replicated ledger, which may be public or private, permissioned or permissionless, or driven by tokenized crypto economics or tokenless" [20] and definition of smart contract as "event driven program, with state, that runs on a ...
It is used to symbolize the ever-growing consensus on the Cardano blockchain. Ouroboros is a family of proof-of-stake consensus protocols used in the Cardano and Polkadot blockchains. It can run both permissionless and permissioned blockchains. [1] Ouroboros was published as "the first provable secure PoS consensus protocol".