Mechanism
Each anchor node maintains a memory-resident UID cache that stores UID records, alias registrations, lineage graph fragments, and policy constraints for the content objects within its governed variance bands. The distinguishing property of the disclosed cache is that its behavior is governed dynamically rather than by a static time-to-live configuration. Instead of expiring entries on a fixed schedule or by a global frequency counter, each anchor self-regulates based on its local variance saturation, the access frequency of the entries it holds, the policy constraints attached to those entries, and the semantic relevance of the cached objects to recent queries.
Eviction is initiated by a variance saturation monitor. The monitor continuously evaluates the density of active UIDs within each governed variance band. When a band approaches a configured saturation threshold, the monitor signals the eviction engine to identify and remove low-priority UID entries. Eviction is therefore a response to band-local saturation, not to elapsed time, and the unit over which saturation is measured is the variance band the anchor governs rather than the cache as an undifferentiated whole.
Eviction Priority
When the eviction engine is signaled, it does not remove arbitrary entries. Priority is computed as a function of three inputs: recency-weighted access frequency, slope proximity to recently queried UIDs, and policy-declared retention priority. Entries for stale, low-access, or policy-expired artifacts are evicted first. Entries for high-value, frequently accessed, or policy-protected artifacts are retained.
The inclusion of slope proximity in the priority function is what differentiates this scheme from access-pattern caching. An entry that is not itself frequently accessed may still be retained because its variance vector lies close, in the slope continuum, to UIDs that have recently been queried. The cache thereby keeps the neighborhood of active interest resident, not merely the individual entries that happened to be touched. The access frequency tracker that supplies the first input maintains rolling access counts and recency timestamps for each cached UID entry, and these same statistics inform replication decisions as well as eviction.
Policy-Constrained Retention and Eviction
A policy constraint evaluator enforces governance rules embedded in each UID's policy field at the time of cache admission, replication, and eviction. Policy objects may specify time-bounded retention, after which cached entries are automatically marked for eviction regardless of access frequency. This is the disclosed counterpart to a time-to-live, but it is a per-entry, policy-declared bound carried by the artifact rather than a single global setting applied indiscriminately to the cache.
Policy objects may also specify zone-local propagation only, prohibiting replication of an entry to anchors outside the originating trust zone even when variance proximity would otherwise qualify an adjacent anchor for replication. A further policy option is read-only proxy status, which permits an anchor to serve UID metadata and alias lookups without retaining full lineage graphs, as implemented by the read-only proxy cache. Retention, eviction, and replication are thus all gated by the same versioned, signed policy objects that govern the underlying content, so the conditions under which an entry leaves the cache are reproducible from the policy object rather than determined by an opaque heuristic.
Quorum-Initiated Invalidation
Separate from saturation-driven eviction, the cache processes invalidation events through a cache invalidation event handler. This handler processes quorum-initiated invalidation signals, semantic rollback events, and fork adjudication outcomes. Eviction removes an entry because a band is full or its retention window has lapsed; invalidation removes or quarantines an entry because the network has decided the entry is no longer authoritative.
Invalidation through anchor quorum decision arises, for example, because a lineage audit detects variance discontinuity exceeding the configured similarity threshold, or because a duplicate alias claim is resolved against the cached artifact. On such a decision the handler flags the affected UID entry, notifies downstream subscribers if configured, and removes or quarantines the entry. The disclosed cache distinguishes these two paths so that a consumer can tell a capacity-driven removal apart from a governance-driven one.
Recording and Surfacing Invalidation
Invalidation events are recorded in the anchor's event log and may be included in future resolution responses to inform querying nodes of the invalidation status. The record is not a separate tamper-evident ledger maintained for the cache alone; it is the same anchor event log in which the disclosure records alias mutations, resolution attempts including negative results, and fork adjudication outcomes. A querying node that resolves a UID can therefore learn that the entry was invalidated as part of the resolution response itself, without a separate lookup.
Because invalidation status travels with resolution, a node that holds a stale copy can be told, at the moment it next resolves the UID, that the copy is no longer authoritative. The disclosure additionally provides that cached UIDs exceeding a configured staleness threshold are flagged for re-validation before being served, preventing cached content from drifting beyond its permitted propagation scope.
Replication and Consensus Coupling
The cache does not operate in isolation from the anchor consensus layer. UIDs experiencing sustained access volume above a configurable threshold may trigger selective replication to secondary anchor nodes within the same band cluster, as governed by the replication controller. Replication is scoped to the band cluster and constrained by the trust zone policy of the originating anchor, preventing unauthorized propagation to external zones.
Cache replication coordination among anchors within a slope band cluster operates under the Adaptive Consensus Protocol. When a new UID is registered with a primary anchor, that anchor may initiate a selective replication proposal to secondary anchors. The proposal specifies the UID record, the variance band, the applicable policy constraints, and a replication priority score derived from the global variance of the artifact and the access history of the registering agent. Secondary anchors evaluate the proposal against their local memory availability and band governance configuration and respond with acceptance or rejection, and a quorum of accepting anchors is required before the UID is considered durably replicated within the cluster.
Prior Art
Conventional caching frameworks rely on time-to-live heuristics, frequency-of-access counters, or manual invalidation signals that are indifferent to the structural variance of cached content, the mutation distance between cached and current versions, or governance constraints on propagation scope. They expire entries on a fixed schedule or by raw access frequency, with no notion of the variance band a content object occupies and no mechanism to retain the slope-proximate neighborhood of recent queries.
The disclosed cache differs by tying eviction to band-local variance saturation, by computing eviction priority partly from slope proximity to recently queried UIDs rather than from access pattern alone, and by gating admission, retention, replication, and eviction through versioned signed policy objects carried with each entry. It further separates capacity-driven eviction from quorum-initiated invalidation, and it records invalidation in the anchor event log so that querying nodes learn invalidation status as part of resolution rather than continuing to serve content the network has retracted.
Disclosure Scope
The adaptive cache governance mechanism, comprising the memory-resident UID cache, the variance saturation monitor that signals the eviction engine when a governed band approaches a saturation threshold, the eviction priority function computed from recency-weighted access frequency, slope proximity to recently queried UIDs, and policy-declared retention priority, the policy constraint evaluator enforcing time-bounded retention, zone-local propagation, and read-only proxy status, the cache invalidation event handler processing quorum-initiated invalidation, semantic rollback, and fork adjudication outcomes, and the recording of invalidation in the anchor event log for inclusion in future resolution responses, is disclosed in PCT International Application No. PCT/US26/28630 at Section 6, with related cache policy enforcement at Section 9 and the corresponding system recital that the cache memory is dynamically pruned, retained, or refreshed based on local variance saturation levels, semantic traffic volume, and policy-declared retention priority. This article describes that disclosed mechanism. The scope extends to alternative band granularities and to deployments in which the cache participates in selective replication under the Adaptive Consensus Protocol, provided eviction remains governed by variance saturation, slope proximity, and policy rather than by static time-to-live configuration.
