ENSIP-10 standardizes a real resolver-discovery fallback, not just a resolver feature. If a subdomain has no resolver, clients walk up parent labels until they find one, then resolve the original full name through that parent-discovered resolver.
The most important architectural split is between resolver discovery and record interpretation. A parent node can supply the resolver, but the resolver still receives the original child name in DNS wire format and answers for that exact subject.
The resolve(bytes name, bytes data) interface is the enabling mechanism for label-aware wildcard behavior. Plaintext labels become available to the resolver, which is why ENSIP-10 can support schemes like deterministic per-label addressing or NFT-ID-derived subdomains.
Exact-match resolvers remain a hard override. Wildcard logic is not global magic; it only applies when the walked parent supplies the first resolver and no child resolver has already been set.
The spec is unusually explicit about compatibility and safety boundaries. Legacy clients just fail on wildcard-only names, and compliant clients must not call legacy methods like addr() on parent-discovered wildcard resolvers.
The security section is worth keeping in view because wildcard resolution increases typo and misrouting risk even while making mass subdomain issuance far cheaper and faster.
Specific source signals worth retaining
The ENSIP-10 spec page and raw ENSIP text are the best direct sources for the parent-walk algorithm, the ExtendedResolver interface, the ERC-165 interface ID 0x9061b923, and the exact-match-versus-wildcard client rules.
The raw ENSIP text is especially useful because it preserves the frontmatter metadata: created date, final status, and contributor identities.
The ENSIPs repository README is the best compact source for how ENSIPs are treated procedurally: accepted standards text in a dedicated repository separate from ENS DAO governance proposals.
The spec rationale is the clearest source for why plaintext-label access matters: without it, some wildcard use cases would be impossible because namehashes hide label content.
Why this entry belongs in the corpus
It gives the ENS cluster an explicit lower layer for wildcard resolver discovery and plaintext-label resolution rather than flattening those mechanics into later ENS reverse-name or identity features.
It helps separate registry writes, parent fallback policy, resolver-side computation, and client compatibility behavior.
The durable insight is that a large share of naming power can move from registry state to client search rules and resolver-side logic once wildcard resolution is standardized.