linearchain

Linearchain is a conceptual data structure used in distributed systems to maintain a single, linear ledger of records. Each record, or block, contains a payload, a timestamp, and a cryptographic hash of the immediately preceding block, producing an immutable chain of custody. Unlike blockchains that allow forks, a linearchain enforces a strict linear order, so there is one canonical chain at any time.

Operation and consensus in a linearchain rely on agreement among participants to extend the chain. Because forks are disallowed, the consensus mechanisms can be simpler, potentially relying on a centralized authority, proof of authority, or other fast-finality rules. Validation focuses on the integrity of the hash links and the validity of the block payload, while reorgs are typically avoided and the head of the chain advances only after consensus.

Structure and storage considerations include the append-only nature of blocks and a moving head pointer that marks the current canonical chain end. Some implementations use periodic checkpoints to prune older data or compress history while preserving immutability of the validated portion.

Applications commonly discussed for linearchains include audit logging in regulated environments, event sourcing in software architectures, and provenance tracking in supply chains. They are valued for simplicity and deterministic finality but may face limitations in fault tolerance, scalability, and decentralization due to the inherently linear structure.

See also: blockchain, distributed ledger, event sourcing.