Permissioned Ledger
Definition
A distributed ledger in which participation is controlled by a known set of validators (for example, Hyperledger Fabric). Unlike public blockchains, a permissioned ledger can be governed by an identifiable organisation, which may make its records more or less suitable as evidence depending on the legal context.
- Participation control
- Known, restricted set of validators
- Example platform
- Hyperledger Fabric
- Contrasted with
- Public, permissionless blockchains
- Governance
- Identifiable controlling organisation
Common questions
Why can identifiable governance affect a permissioned ledger's evidentiary value?+
A court can subpoena or question the operating organisation about access controls, audit logs, and change history, giving a chain of accountability that anonymous, decentralised public blockchains generally cannot offer.
Does a permissioned ledger sacrifice tamper-evidence compared to a public blockchain?+
Not necessarily for the records themselves, cryptographic hashing and consensus still make retroactive tampering detectable, but the smaller validator set means trust ultimately rests more on the operator's integrity than on broad decentralisation.
In what media provenance context is a permissioned ledger typically used?+
Organisations such as news outlets or content platforms have used permissioned ledgers to timestamp and log the origin and edit history of media files, aiming to support authenticity claims for that content later.
Related terms
- C2PA (Coalition for Content Provenance and Authenticity)
- An open technical standard that embeds cryptographically signed provenance assertions into media files at the point of capture or editing. A C2PA...
- Cryptographic Hash
- A fixed-length digest produced from a file's bytes by an algorithm such as MD5 (128-bit), SHA-1 (160-bit), or SHA-256 (256-bit). Identical files...
- NFT (Non-Fungible Token)
- A unique cryptographic token on a blockchain associated with a reference to a media asset. NFTs record ownership transfers and can carry...
- Oracle Problem
- In blockchain contexts, the gap between what the ledger records and the real-world state it is meant to represent. A blockchain has...
- Provenance Manifest
- A structured record, either embedded in a file or stored externally, that documents a media asset's origin, capture conditions, chain of custody,...