Creator & Lead Developer of Nexus Core Gateway — an autonomous M2M legal-code engine for EVM infrastructure: ABI drift detection, high-fidelity Solidity drafting, and machine-readable security verification.

I architect systems where smart contracts are verified, not just written. My work operates at the seam between three layers that most tooling treats separately: the Solidity source, the EVM state machine it compiles to, and the canonical execution layer (Rust precompiles / node dispatchers) that ultimately interprets every selector. When those layers drift apart, contracts compile clean and break silently at runtime — my entire pipeline exists to catch that class of failure before mainnet does.

Every audit, PR, and advisory I ship is backed by the Nexus Core Gateway — a self-built verification pipeline (v4.3.0-frontier, live on Supabase Edge, registered on-chain as ERC-8004 Agent #636 on Polygon). It is not a wrapper around existing tools; it is a Digital Twin engine that reconstructs what the EVM will actually do:

• Anvil / Foundry state-forking PoCs — every candidate finding must prove real-world impact against a forked mainnet state, not a synthetic harness. A dust-spam DoS is only real if 5,000 dust stakes actually push a withdraw past the 30M block gas limit on a real chain state.
• Low-level signature parity checks (v/r/s) — byte-level verification of secp256k1 parity conventions across signers (27/28 vs 0/1), high-s normalization, and EIP-2098 compact encodings. This is where "it compiles" and "it recovers the right address" diverge.
• Invariant fuzzing — state properties, not just happy-path assertions. PPS monotonicity, custody invariants, and accounting conservation get fuzzed until they break or hold.
• Cross-layer verification (Rust ↔ Solidity) — ABI signatures extracted from canonical crate::sol! node definitions and diffed against Solidity interface mirrors, with transitive inheritance resolution and selector-level type normalization. When the execution layer gets redesigned (T12-style), the mirror cannot rot silently.

The gateway enforces a stop-submit gate: no finding ships to a public tracker below a 95% confidence threshold, and every report must survive a mechanical PoC before a human ever reads it.

The kind of low-level safety thinking that goes into every draft — a minimal sentinel pattern using EIP-1153 transient storage for gas-cheap reentrancy protection, with an assembly-guarded signature parity check:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/// @notice Minimal autonomous security sentinel.
/// @dev Reentrancy guard lives in transient storage (EIP-1153): zero SSTORE cost,
///      zero storage slots, fully reverted at the end of the tx — the guard
///      cleans up after itself by construction.
interface INexusSentinel {
    event SentinelArmed(bytes32 indexed scope, uint64 deadline);
    error SentinelTripped(bytes32 scope);
    error SignatureParityMismatch(uint8 v);
}

abstract contract NexusSentinel is INexusSentinel {
    // EIP-1153 transient slot — never touches persistent state.
    uint256 private constant _GUARD = 0x7f6b0001;

    modifier guarded(bytes32 scope) {
        assembly ("memory-safe") {
            if tload(_GUARD) { mstore(0x00, 0x9c7f66ac) revert(0x00, 0x04) } // SentinelTripped
            tstore(_GUARD, or(scope, 0x1))
        }
        _;
        assembly ("memory-safe") {
            tstore(_GUARD, 0)
        }
    }

    /// @dev Accepts both secp256k1 parity conventions (27/28 and 0/1) and
    ///      rejects high-s blobs — a signature that recovers the wrong
    ///      address is worse than no signature at all.
    function _checkParity(uint8 v, bytes32 s) internal pure returns (uint8) {
        if (s > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            revert SignatureParityMismatch(v);
        }
        return v >= 27 ? v - 27 : v; // normalize to y-parity
    }
}

• Confetti — GHSA-3g9w-x8qp-2qpq — phantom-vote reward theft (high severity); maintainer shipped the exact recommended fix within 5 hours, plus a regression test and version bump.
• Solady — PR #1562 — two real bugs in LibBytes (split memory corruption via null-path scratch-pointer read; missing bounds check in dynamicStructInCalldata), fixed with a 5-test regression suite; 1,597/1,597 tests green.
• tempo-std — PR #145 — flipV parity-convention bug + full T12 ABI resync + check-drift.py, a cross-layer Rust↔Solidity ABI drift checker offered for CI integration.
• Uniswap v4-core — PR #1073 — doc-hygiene fixes surfaced by a full EIP-1153 revert-semantics trace of PoolManager.
• Lido staking-modules — PR #878 review — pre-audit design review of CM v2 balance checkpoints: 3 design flags, 0 false positives.
• Nexus Core Gateway — deployed end-to-end: EIP-712 pull-payment contract live on Polygon mainnet, Python + TypeScript SDKs published (PyPI / npm), on-chain ERC-8004 identity, live security playground.

My clients are machines. The gateway speaks pure JSON over HTTP, publishes an A2A discovery manifest, bills itself in USDC via EIP-712 pull payments, and registers its identity on-chain. If your agent wants to audit, draft, or verify Solidity — it can hire mine without a single human meeting.

"A contract that compiles is not a contract that works. Verify the state machine, not the syntax."

— Nexus Gateway Architect

For security teams, maintainers, or human leads requiring private disclosure triage, automated pre-audits, or asynchronous security scans:

• Inbound Email: rakhmadaa@gmail.com
• Expected Subject Format: [SECURITY-INQUIRY] <Protocol Name> - <Target Commit/Scope>
• Ingestion Endpoint (H2M pipeline): https://xibzsthfrbomefnvbicb.supabase.co/functions/v1/hello-world/ingest/security-inquiry
• Gas Asymmetry Guard: quantitative compute-to-gas ratio analysis (threshold > 12.5 → validator-delay DoS flag) is active in the ingestion layer, with automatic audit logging to the append-only poa_ledger.

Automated Dynamic Triage Note:
Inbound inquiries are routed to the gateway pipeline for automated state-machine pre-scanning. The engine generates a signed proposal with a dynamically adjusted pricing manifest (USDC via Polygon/EIP-712) and timeline. No manual meetings or price negotiations required. Every inquiry is automatically recorded to the immutable Proof-of-Activity ledger.