XAI · rollup-L2 · QRI 11 · BAND 1 Aware-Only Hybrid FAIL · Stage 0 · Washing 0x

Xai is an Arbitrum Orbit gaming L3 with 75,000 Sentry Nodes that sound decentralized and a sequencer that is not. The AnyTrust DAC adds a second classical signature set on top of inherited classical ECDSA, which is twice the work to migrate and none of the PQ benefit.

inLinkedIn XPost ▼Scorecard JSON ⇆Compare Verified 2026-04-17

Summary

Xai is an Arbitrum Orbit L3 for Web3 gaming with AnyTrust data availability and ~75K Sentry Nodes. Inherits Arbitrum crypto; no independent PQ work. AnyTrust DAC adds a second signature set (also classical) on top of inherited ECDSA. Not a standalone PQ story.

What the gates say

Hybrid: FAIL. No hybrid plan on file.
Evidence: PASS. Sources reconstructable by third party.
Primitive naming: PASS. Named primitives at every scored sub-level.

Burn-vs-rescue policy on file

none-announced

Seven dimensions

Each dimension scores 0-100 internally; the weighted roll-up produces the QRI on the left. Open a row to read the sub-score detail.

1 Cryptographic Exposure 18 / 100

1a_primitive_inventory 8 / 20

Arbitrum Orbit L3 with AnyTrust DA mode; Sentry Node network adds verification layer.

Primitives: ECDSA secp256k1 (Arbitrum Orbit) · Keccak-256 · AnyTrust data availability committee signatures

Evidence:

1b_shor_grover_pq_tag 4 / 20

1c_algorithm_family_diversity 2 / 20

No PQ family.

1d_nist_security_category 2 / 20

1e_implementation_quality 2 / 20

2 HNDL Exposure 18 / 100

2a_active_key_exposure 5 / 20

Gaming L3; per-game active keys.

2b_cold_key_exposure 5 / 20

Young chain (2024); small dormant.

2c_signature_longterm_validity 4 / 20

Classical ECDSA.

2d_encryption_confidentiality 4 / 20

TLS.

3 Metadata & Privacy Exposure 18 / 100

3a_tx_graph_visibility 4 / 20

AnyTrust DA mode: data available off-chain via DAC, reducing visibility but also reducing trust assumptions.

3b_rpc_mempool_concentration 5 / 20

Offchain Labs + Xai Foundation sequencer.

3c_cross_chain_bridge_correlation 5 / 20

Arbitrum One<->Xai bridge.

3d_retroactive_deanon_risk 4 / 20

No privacy layer.

4 Migration Architecture 32 / 100

4a_crypto_agility 9 / 20

Inherits Arbitrum Orbit path.

4b_account_abstraction_key_rotation 10 / 20

ERC-4337 available.

4c_hard_fork_track_record 7 / 20

Brief Nitro-inherited track record.

4d_hybrid_deployment_readiness 6 / 20

No PQ roadmap.

5 Deployment Execution 3 / 100

5a_mainnet_pqc_pct 0 / 20

Zero PQC.

5b_pqc_code_in_client 1 / 20

No PQ code.

5c_validator_pqc_adoption 0 / 20

~75K Sentry Nodes (verification layer) but not signers; sequencer centralized.

5d_published_milestones_count 1 / 20

No PQ milestones.

5e_pqc_washing_delta 1 / 20

No claims.

6 Supply Chain Vendor Readiness 5 / 100

6a_wallet 1 / 20

6b_bridge 1 / 20

6c_custodian 2 / 20

6d_rpc_hsm 1 / 20

7 Governance & Coordination 28 / 100

7a_validator_stake_distribution 5 / 20

Sentry Nodes decentralized (~75K) but sequencer centralized.

7b_upgrade_cadence_under_pressure 7 / 20

Orbit-inherited.

7c_named_coordination_lead 9 / 20

Named: Xai Foundation, Offchain Labs.

7d_adversarial_coordination_precedent 7 / 20

No precedent.

The X + Y vs Z inequality

X (data shelf life): 3-8

Y (migration time): 5-10 (Arbitrum-dependent)

Z10 (10% CRQC year): 2036 · Z50 (50%): 2041

Verdict: X+Y > Z (danger).

Four-scenario grid

Scenario	Value preserved	Privacy preserved
quantum never	100%	100%
arrives suddenly pre migration	10%	8%
arrives slowly post migration	50%	25%
arrives slowly mid migration	25%	12%

Peers in the rollup-L2 profile

Order-book view of the 9 chains closest to Xai by QRI.

Manta Pacific

World Chain

Mantle

Optimism (OP Mainnet)

Public artifacts used for this scorecard

Each entry below is a sub-score citation. Clicking the link takes you to the public source. A third party should be able to reconstruct every number on this page from these URLs in 48 hours.

Cryptographic Exposure · 1a_primitive_inventory

Arbitrum Orbit L3 with AnyTrust DA mode; Sentry Node network adds verification layer.

v1:chainscreen-v1-archive/data/chains/xai.json

Supply chain snapshot

wallet MetaMask · Rabby · Xai native 0 PQC roadmaps

bridge Arbitrum canonical · Axelar · Stargate 0 PQC roadmaps

custodian Coinbase Custody · BitGo · Anchorage 0 PQC roadmaps

rpc_hsm Offchain Labs RPC · Alchemy · QuickNode 0 PQC roadmaps

A chain's supply chain cannot migrate faster than its slowest dependency. Zero PQC roadmaps in any of the four categories is a structural blocker, not a lagging indicator.

Analyst notes on the scoring

Stage 0. Sentry Node count is a governance signal but not PQ-relevant without independent validation scheme.

Scorecard metadata

Profile: rollup-L2
Scored: 2026-04-17 by layerqu-v2-scoring-agent-5
v1 reference: chainscreen-v1-archive
QRI raw: 13 · after caps: 11
Confidence interval: ±5
PQC washing ratio: 0x
Burn-vs-rescue: none-announced

Caps triggered

mosca_cap_60 (5a=0)
sutor_cap_50