Institutional-Grade Wallet Security Ratings
Linkmerica evaluates digital custody architecture using a structured risk-weighted framework (LISR).
Wallet Index
LISR v1.0 — 4 wallets scored. Scores are deterministic, versioned, and locked at publication. Lower score = lower custody risk.
Ledger
MODERATE RISK| Category | Score | Risk Bar |
|---|---|---|
| Security Architecture | 3.2 |
|
| Firmware Integrity | 6.4 |
|
| Supply Chain Risk | 6.2 |
|
| Key Management | 2.8 |
|
| Operational Security | 3.4 |
|
| Recovery Risk | 4.2 |
|
- Closed-source firmware and operating system
- Centralized supply chain with single manufacturer
- Historical data breach exposure (customer database, 2020)
Trezor
MODERATE RISK| Category | Score | Risk Bar |
|---|---|---|
| Security Architecture | 5.5 |
|
| Firmware Integrity | 2.8 |
|
| Supply Chain Risk | 6.2 |
|
| Key Management | 3.2 |
|
| Operational Security | 4.5 |
|
| Recovery Risk | 3.8 |
|
- No secure element in Trezor One
- Susceptibility to physical side-channel attacks on Trezor One
- Supply chain lacks comprehensive tamper-evident packaging
Tangem
MODERATE RISK| Category | Score | Risk Bar |
|---|---|---|
| Security Architecture | 4.2 |
|
| Firmware Integrity | 7.8 |
|
| Supply Chain Risk | 6.5 |
|
| Key Management | 5.5 |
|
| Operational Security | 4.8 |
|
| Recovery Risk | 6.2 |
|
- Closed-source firmware with no reproducible build verification
- Centralized manufacturing with single vendor dependency
- No user-accessible seed phrase by default—backup dependent on additional cards
SafePal
HIGH RISK| Category | Score | Risk Bar |
|---|---|---|
| Security Architecture | 5.5 |
|
| Firmware Integrity | 8.2 |
|
| Supply Chain Risk | 7.8 |
|
| Key Management | 4.5 |
|
| Operational Security | 5.0 |
|
| Recovery Risk | 4.8 |
|
- Binance strategic investment — regulatory exposure and ecosystem centralization risk
- Closed-source firmware across all product lines
- Proprietary secure element implementation without independent verification
Methodology
The Linkmerica Institutional Security Rating (LISR) is a deterministic, versioned custody risk framework produced by the Linkmerica Research Team. Scores are locked at publication and cannot be retroactively altered. Methodology revisions increment the LISR version number and are disclosed in the public changelog. This summary discloses scoring categories and weights. Internal scoring math and evidence weighting are proprietary.
| Category | Weight | Description |
|---|---|---|
| Security Architecture | 25% | Cryptographic design, secure element implementation, physical attack resistance. |
| Firmware Integrity | 20% | Firmware signing, update verification, reproducible builds, vulnerability disclosure. |
| Supply Chain Risk | 20% | Manufacturing provenance, anti-tamper mechanisms, distribution chain controls. |
| Key Management | 15% | Seed generation, entropy quality, BIP-39 implementation, multisig compatibility. |
| Operational Security | 10% | PIN lockout controls, duress mechanisms, air-gap quality, display verification. |
| Recovery Risk | 10% | Seed backup mechanisms, metal backup compatibility, recovery standardisation. |
| Score Range | Risk Tier | Institutional Guidance |
|---|---|---|
| 0.0 – 3.5 | LOW | Suitable for institutional consideration with standard diligence. |
| 3.6 – 6.0 | MODERATE | Requires additional controls or policy mitigations. |
| 6.1 – 8.0 | HIGH | Significant risk factors present — limited institutional suitability. |
| 8.1 – 10.0 | CRITICAL | Not recommended for institutional custody use. |
LISR scores are deterministic and version-controlled. Lower scores indicate lower custody risk. Scores reflect publicly observable factors at time of review and are subject to revision following material firmware updates, security incidents, or scheduled review periods. Internal weights and scoring math are proprietary to the Linkmerica Research Team.
Research
NEW — JUNE 2026Agent Pay for Machines: The Custody Risk Surface of Machine-to-Machine Payments
On June 10, 2026, Mastercard launched AP4M — a machine-to-machine payment protocol with 30+ partners including Coinbase, Anchorage, and Ripple. The Linkmerica Research Team analyzes the custody risk surface, rail fragmentation problem, and LISR framework implications for institutional agent wallet deployment.
LISR Advisory Review
A structured, written institutional custody risk assessment produced by the Linkmerica Research Team under the LISR framework. Asynchronous — no calls required. Delivered within 5 business days.
- Registered Investment Advisors (RIAs)
- Small crypto funds and digital asset managers
- High-net-worth self-custody holders
- Teams managing multisig treasury
- Family offices with direct digital asset holdings
- Device architecture and secure element review
- Key management and entropy assessment
- Backup and recovery exposure analysis
- Operational security and signing workflow
- Governance and change control review
- Incident history and lifecycle risk
Applications submitted via email to research@linkmerica.com. Linkmerica will never request private keys, seed phrases, or direct wallet access. This review does not replace internal controls or legal counsel.
Updates
Periodic custody risk updates and methodology revisions may be published in future releases.