permissioned blockchain [English]
No definition in earlier IP projects. ITrust definition not yet developed.
- Blockchain Technologies 2016 (†789 s.v. "Permissioned Ledger"): A permissioned ledger is a ledger where actors must have permission to access the ledger. Permissioned ledgers may have one or many owners. When a new record is added, the ledger’s integrity is checked by a limited consensus process. This is carried out by trusted actors — government departments or banks, for example — which makes maintaining a shared record much simpler that the consensus process used by unpermissioned ledgers. Permissioned block chains provide highly-verifiable data sets because the consensus process creates a digital signature, which can be seen by all parties. A permissioned ledger is usually faster than an unpermissioned ledger.
- Deloitte Insights 2016 (†801 p.22): A permissioned ledger is a ledger where actors must have permission to access the ledger. Permissioned ledgers map to closed trust-some or trust-all ledgers. Permission is granted in two different ways. The first is via a white list, a list of actors allowed to join the ledger’s community. The second is via a black list, a list of actors who are banned from the ledger’s community: a permissioned ledger using a black list would be a closed, trust-some ledger; a permissioned ledger using a white list could be either an open or closed, trust-some ledger. We note Bitcoin was originally designed to be permissionless, although it is becoming increasingly permission-based as the various services enabling one to access the ledger demand you identify yourself– typically to comply with anti money-laundering or counter-terrorism financing regulations.
- ISO TC307 N38 (United States). 2017. (†834 s.v. "Permissions options" ): Permissioned networks are limited to participants within a given business network. On permissioned blockchains, participants are allowed to view only the transactions relevant to them and are only allowed to perform operations for which they have permission.
- ISO TC307 N67 (United Kingdom). 2017. (†841 p.1; s.v. "permissioned network"): blockchain network where any node is required to maintain a member identity on the network. End users must be authorized and authenticated in order to use the network.
- Seibold et al. 2016 (†821 p.18): A private network in which users set rules about access, the consensus mechanism, governance, participation, etc.
- Brakeville and Perepa 2017 (†813 ): Permissioned networks, on the other hand, are limited to participants within a given business network. On permissioned blockchains, participants are allowed to view only the transactions relevant to them. The Hyperledger Project was founded to support the development of permissioned blockchains. (†2088)
- ISO TC307 N38 (United States). 2017. (†834 s.v. "High-level View of a Blockchain Network): In a permissioned blockchain, users must be enrolled in the blockchain before they are allowed to perform transactions. The enrollment process gives the user credentials that are used to identify the user when he or she performs transactions. (†2190)
- Piasecki 2017 (†815 s.v. 2017-02-20 "Blockchain Terminology-a dev): A Permissioned Blockchain is a Blockchain Project that restricts access to its Blockchain in some way to the users. It could require user authentication before they can connect their nodes to the network, or even download their Clients. · In contrast, Permissionless Blockchains, such as Bitcoin, are inclusive by nature, allowing anyone to join and transact on the network. · Permissioned Blockchains are still in early phases of adoption as of February 2017. For their time being, their target market consists of banks, governments and other large entities that want to exert some form of control over their Blockchain network. This could be done due to regulatory, KYC or other reasons. · Some Permissionless Blockchains do offer some features for their users to restrict access to some of their financial assets. Ripple allows explicit white- and blacklists of Addresses, while Smart Contract scripts give even finer control over how a given asset can be used. (†2104)
- Walport 2016 (†802 p.78): Private block chains are being used in closed commercial communities to support digital trust mechanisms, under their own rules. These are noninteroperable and cannot scale to support supply chains (†2127)