nHeightSrc

nHeightSrc is a term used in codebases related to blockchain, cross-chain communication, and data synchronization to denote the height of the source chain or data stream at a given point in time. While its exact meaning can vary by project, it typically stores an integer value representing how many blocks have been produced on the source chain when the associated data was observed or created.

Naming and intent: The prefix n is common in certain C++ coding conventions to signal a numeric value. Height refers to the block height, and Src indicates the source. This naming helps distinguish the source chain’s progress from other related heights or state indicators within a system.

Typical usage: In cross-chain verification or sidechain scenarios, nHeightSrc anchors data to a specific point on the source chain. It can be used to validate proofs against a known source height, determine whether information is current or stale, and coordinate synchronization between chains or modules. For example, a bridge or watcher component may record the source height when a header or event is observed to ensure subsequent processing aligns with the correct chain state.

Implementation notes: The variable is usually stored as an unsigned integer. Implementations should update nHeightSrc as new blocks appear on the source chain and adjust it in response to chain reorganizations. Because the exact semantics depend on the project, documenting how nHeightSrc interacts with related fields (such as a destination height or proof parameters) is important for correct interpretation.

See also: block height, chain synchronization, cross-chain bridge, sidechain, proof of inclusion.