Defimec — One Signing Surface for Solana, Base & Arbitrum

The Problem

Why multi-chain signing is broken

Every time you sign across chains, you're trusting three separate RPC configs, three separate approval flows, and zero cross-chain verification.

Chain-ID mismatch drain

Stale RPC returns wrong network ID. Your approval goes to the wrong chain. By the time the tx confirms, the funds are gone. Happens in seconds.

Blind signing

Your hardware wallet shows raw hex. No decoding. You're approving something you can't read — and 0x23b872dd looks like every other swap.

Approval fragmentation

Solana. Base. Arbitrum. Three separate signing flows, three separate interfaces, zero unified approval surface. One misconfiguration can cost everything.

How Defimec fixes this

One signing surface. Everything verified before your hardware signs.

Before the signing request reaches your Ledger, Defimec has already probed the RPC for a live chain-ID response, locked the target network, and decoded the calldata to a readable format.

Chain routing verified

Every signing request passes through a live chain-ID check against the active RPC. Mismatch = blocked before your Ledger ever sees it.

Calldata decoded

Raw hex translated to human-readable intent before you approve. See exactly what function, which contract, how much — on the Ledger screen.

Ledger path locked

BIP44 derivation path and chain-ID are bound together at signing time. Prevents cross-chain path collisions from misconfigured account indexes — a common source of silent mis-routing on multi-chain setups.

Chain Coverage

Purpose-built for three chains

Program upgrade authority checks, versioned transaction (V0) decode with address lookup table resolution, stake account instruction decoding, and RPC cluster verification — built for Solana's Ed25519 account model, not retrofitted from EVM.

RPC endpoint poisoning and program-ID spoofing — both validated before any instruction is signed.

OP Stack chain-ID lock at 0x2105, sequencer endpoint verification against the canonical Base sequencer, ERC-4337 UserOperation calldata decode, and OP Stack fork disambiguation — Base vs OP Mainnet vs Zora are distinct.

Chain-ID confusion across OP Stack forks and sequencer substitution attacks.

Nitro AnyTrust calldata expansion before decode, Arbitrum One (0xa4b1) vs Nova (0xa4ba) chain-ID lock, EIP-712 domain separator validation with Arbitrum chain ID, and bridge router calldata decode for L2-to-L1 message signing.

Nitro calldata blind signing and Arbitrum One / Nova chain-ID mix-up.

View chain details

How It Works

From Ledger connect to verified signature in three steps

Defimec sits between your hardware wallet and the chain endpoint, adding a verification layer that doesn't slow you down — it just stops you from signing the wrong thing.

See full walkthrough

Connect Ledger → Defimec layer

Defimec registers as the signing relay. Your Ledger connects once; all three chains route through a single verified session.

RPC probe — chain ID verified live

Before any signing request is passed to Ledger, Defimec probes the active RPC endpoint and confirms the returned chain ID matches your target network.

Sign with decoded calldata preview

Your Ledger displays the decoded function call — not raw hex. You see what you're signing before you approve.

Security

Built for precision, not promises

No fabricated audit claims. No compliance badges we haven't earned. Four verifiable technical controls built directly into the signing path.

RPC integrity check

Live probe against each RPC endpoint on every signing session. Stale or malicious nodes are flagged before any request is forwarded.

Chain-ID lock before signing

EIP-155 chain ID is verified and locked to the target network before the signing request reaches Ledger. Mismatch halts the flow.

EIP-712 structured signing

Typed data is validated against the EIP-712 domain separator, including the chainId field — so cross-chain replay attacks are structurally blocked.

No broadcast until confirmed

Transaction broadcast is held until Ledger confirms the decoded calldata. The network never sees your transaction until you've explicitly reviewed and approved.

Read security approach

From traders using Defimec

What early access users say

I was signing across Base and Solana with three different wallet setups. The first week I used Defimec I caught a stale RPC on my Base config that would have sent a 2400 USDC approval to a shadow fork. That's the kind of thing you only find out about after.

Active DeFi trader — Solana + Base, multi-protocol

Treasury ops across three chains means approvals from three signers with three different hardware setups. Defimec gave us one surface to coordinate from — and the calldata decode stopped a misfired Nitro transaction from clearing.

Treasury operator — three-chain multisig, bootstrapped protocol

Early access open

Stop signing blind.

One Ledger. Solana, Base, and Arbitrum — each RPC verified, each calldata decoded before you confirm.

Get Early Access Read the docs

One surface.Three chains.Zero mismatch.