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ENSNode

Glossary

This page defines the core terminology used throughout the ENSRainbow codebase and documentation. If you notice an unfamiliar word elsewhere in the docs, come back to this page – it is probably defined here.

Label

Section titled “Label”

A single component of an ENS name (characters between two dots). Can contain any valid UTF-8 string – it may or may not be ENS-normalised.

Example: vitalik, 😺, example.eth has labels example & eth

Labelhash

Section titled “Labelhash”

keccak256 hash of the UTF-8 bytes of a label (no pre-normalisation), represented as a 0x-prefixed 64-digit lowercase hex string (32 bytes).

Example: 0xaf2caa…03cc

Heal

Section titled “Heal”

The act of converting a labelhash back to its original label via a rainbow table lookup.

Example: heal('0xaf2c…') → 'vitalik'

Rainbow Record

Section titled “Rainbow Record”

An entry mapping a labelhash ➜ label. Persisted as a LevelDB key (labelhash bytes) and UTF-8 value (see Data Model).

Label Set

Section titled “Label Set”

A logical collection of rainbow records that share a common source and versioning scheme. Each label set represents a dataset snapshot that enables deterministic healing across time. Label sets are identified by a labelSetId and labelSetVersion.

Example: id: subgraph, version: 0

Label Set ID

Section titled “Label Set ID”

String (1-50 chars) consisting of lowercase ASCII letters and hyphens that names a label set.

Example: subgraph, discovery-a

Label Set Version

Section titled “Label Set Version”

Non-negative integer that monotonically increases when new labelhash-to-label mappings are added to a label set. Each version contains incremental additions since the previous version. Version 0 is always the initial dataset. Enables deterministic healing across time by allowing clients to pin to specific versions for reproducible results.

Example: 0, 1, 2

Healable Count

Section titled “Healable Count”

Total number of labels that can currently be healed by the running server. Exposed via /count.

Example: 7 892 001

Status Code

Section titled “Status Code”

High-level outcome of an API call – either success or error.

Error Code

Section titled “Error Code”

HTTP-style numeric code describing the error (400, 404, 500).

Rainbow Table

Section titled “Rainbow Table”

A pre-computed set of labelhash → label pairs used for healing.

Ingestion

Section titled “Ingestion”

One-off process that streams a .ensrainbow snapshot into LevelDB.

Example: pnpm run ingest subgraph_0.ensrainbow

System Key

Section titled “System Key”

Special LevelDB key (length ≠ 32 bytes) storing metadata such as schema version, label set id, etc.

Example: 0xff 0xff 0xff 0xfd

ENS Normalization

Section titled “ENS Normalization”

The ENSIP-15 canonicalisation process; ENSRainbow stores labels as-is, even if not normalised.

Section titled “Related Documentation”