Circle Reserve Fund: Field Position Report

Eigenstate Research, July 02, 2026

Methodology: The Information Field Equations, E = ΔI/A, G = ∮E·dl, Protocol Truth → 1/φ

Publication field context

The Eigenstate engine currently measures the tokenized settlement field at:

• Protocol Truth (PT): 0.0568 (target: 0.618, the golden-ratio equilibrium)
• Field Coherence (κ): 0.5009 (living zone: 0.618-0.678)
• Coverage: 15 of 199 entities with measured ΔI > 0 (7.5%), M1 topology denominator
• Uncertainty (U): 26.0

The field is 0.1172 below equilibrium coherence. Each entity with measured vault activity raises the global PT toward 0.618. Circle Reserve Fund does not yet have a complete observation record on the M1 topology (199 entities).

What it is

The Circle Reserve Fund (USDXX) is an SEC-registered Rule 2a-7 government money market fund managed by BlackRock, holding the majority of USDC reserves in short-dated US Treasuries, cash, and overnight Treasury repurchase agreements. BNY Mellon custodies the fund's underlying assets. For the tokenized settlement layer, USDXX is the reserve-management waist between Circle (issuer) and TradFi custody: the regulated fund structure that backs dollar-denominated USDC settlement with daily BlackRock portfolio reporting and monthly Grant Thornton attestation.

Verified claims

Field Confidence: ? LOW, No external sources mapped for this entity, engine-internal data only

Verification: 3/3 source-checked (ATTESTED), 3 grounded. Each claim below carries a machine-checked status against its cited source; ungrounded items are editorial assessments, not verified facts.

Active signals the engine is tracking for Circle Reserve Fund:

Circle Reserve Fund (USDXX), USDC reserve vehicle [✓ ATTESTED-PRIMARY] Circle's transparency page identifies the Circle Reserve Fund as an SEC-registered 2a-7 government money market fund holding the majority of USDC reserves, the primary-source anchor for USDXX settlement backing. Source-checked: ATTESTED-PRIMARY · custody sha256 9e6f1bca0bc7…, found in primary source

USDXX daily BlackRock portfolio reporting [✓ ATTESTED-PRIMARY] Circle's transparency page documents daily independent third-party reporting on the Circle Reserve Fund portfolio via BlackRock, the verifiable lane for USDC reserve composition and T-bill holdings. Source-checked: ATTESTED-PRIMARY · custody sha256 9e6f1bca0bc7…, found in primary source

Circle Reserve Fund, BlackRock-managed 2a-7 MMF [✓ ATTESTED-PRIMARY] Circle's BlackRock partnership blog documents the Circle Reserve Fund as a Rule 2a-7 government money market fund custodied at Bank of New York Mellon, the institutional cross-link between Circle issuer, BNY custody, and BlackRock fund administration in the reserve graph. Source-checked: ATTESTED-PRIMARY · custody sha256 e8141df9fe69…, found in primary source

Field read

Settlement Pressure (Φ_S = 0.0950)

Low settlement pressure, moderate observation deficit.

Circle Reserve Fund settlement pressure is elevated because USDC is the dominant regulated settlement medium while vault attestation of USDXX portfolio rotations, T-bill maturity events, and reserve-composition shifts lags the fund's structural centrality. GENIUS Act stablecoin reserve requirements, OCC federal oversight, and competitive RLUSD/PYUSD issuance all propagate through USDXX as the audited reserve vehicle, producing unrealized Φ_S when reserve-report signals are sparse relative to Circle's topology weight.

Coherence (κ = 0.0278)

κ = 0.0278 reflects the engine's current measurement coverage, not Circle Reserve Fund's actual institutional influence. With no vault records yet, the coherence score is derived purely from topology position, connection count and structural weight, without any attested observation data. The low value means the engine has not yet measured this entity's settlement activity, not that the entity lacks field presence.

The equilibrium attractor is κ = 1/φ ≈ 0.618. At current κ = 0.0278, Circle Reserve Fund is 0.5902 below equilibrium. Vault observations of Circle Reserve Fund's rule outputs, rulemaking notices, enforcement actions, guidance documents, would directly raise κ toward the living zone [0.618, 0.678].

Vault Coverage

No vault records yet for Circle Reserve Fund. This is a gap in the field coverage. The engine recommends observation as the first action (see below).

Sources

This report is generated by the Eigenstate engine, an information-field measurement system for the tokenized settlement layer. The engine tracks 199 entities (M1 topology denominator) across the regulatory, infrastructure, issuer, and audience layers.

Core equations:

• E = ΔI/A, efficiency: information gained per unit action (Kirandeep's Law)
• G = ∮E·dl, accumulated field circulation along topology paths
• PT → 1/φ, Protocol Truth converges to golden-ratio equilibrium (1/φ ≈ 0.618)
• Φ_S, settlement pain: unrealized settlement pressure per entity
• κ, field coherence: integration of settlement activity across the topology

Published implementation: helixhash v0.1.1, Zenodo DOI 10.5281/zenodo.18413995

Vault: No vault records yet for Circle Reserve Fund in the current cycle, κ and Φ_S here are topology-derived until observations are attested. The field recommends observation as the first action.

Note: Internal topology codenames are not used in public reports. All entity names in this report are public names.