What Is Permissioned Ledger?
Also known as: Permissioned Blockchain, Private Blockchain, Consortium Blockchain
In short
A permissioned ledger is a distributed ledger or blockchain in which the right to validate transactions, add blocks and often read data is limited to known, approved participants.
In permissioned systems, an administrating organization or a group of organizations (a consortium) decides who can join the network and which roles they can take on. Because participants are known, energy- and cost-intensive consensus mechanisms such as Proof of Work are unnecessary; Proof of Authority or Byzantine fault tolerant (BFT) algorithms are used instead. This results in high transaction speed, low cost and fast finality.
They are preferred in enterprise scenarios such as interbank payments, supply chain tracking, trade finance and some central bank digital currency (CBDC) pilots. Hyperledger Fabric and R3 Corda are examples of widely used platforms in this area. Meeting data privacy and regulatory compliance requirements is easier in these structures.
Critics point out that permissioned ledgers lack the censorship resistance and trustless design that define public blockchains, and that in practice they are closer to a shared database; if the authorized participants agree, they can alter records or exclude users. For this reason, permissioned and permissionless ledgers are seen less as rivals and more as solutions to different needs.
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