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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.
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]
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.
[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 ...
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 ...
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.
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".
Originally developed in 2019 by Microsoft [2] under the name Coco and later rebranded to Confidential Consortium Framework (CCF), it is an open-source framework for developing of a new category of performant applications that focuses on the optimization of secure multi-party computation and data availability.