When you borrow against Bitcoin, the single most important question is: who controls your collateral while the loan is active? In a custodial model, the answer is the lender — and that is exactly what went wrong when platforms like Celsius and BlockFi collapsed. Coinedge answers it differently with a 3-key multisig vault, where no single party can ever move your Bitcoin alone. This article explains how that works.
What is a multisig vault?
A multisig (multi-signature) vault is a Bitcoin address that requires more than one private key to authorize any transaction. Instead of a single key being able to move the funds, you set a rule like '3 of 3 signatures required.' No transaction is valid unless the required signatures are all present. It is the Bitcoin-native equivalent of a safe-deposit box that needs several keys turned at once.
The three keys
Each Coinedge loan is secured by a unique 3-of-3 multisig address. Three different parties each hold exactly one key:
- Borrower key — generated and held by the borrower. Coinedge never sees or stores it.
- Lender key — held by the participating lender who funded the loan.
- Coinedge coordination key — held by Coinedge as collateral agent, used only to enforce the agreed terms.
All three. Every time.
Moving collateral out of the vault requires all three signatures. No two parties can collude to take the Bitcoin, and no single party — not even Coinedge — can act alone.
Why this removes counterparty risk
Because the collateral lives in a vault that no single party controls, there is no pool of customer Bitcoin for anyone to misuse. Your coins cannot be re-lent, rehypothecated, or moved to cover someone else's losses. Even if Coinedge ceased to operate, your Bitcoin could not be unilaterally seized — the cryptographic rules of the vault, enforced by the Bitcoin network itself, do not depend on any company staying solvent. This is the core of non-custodial lending.
Every step is publicly verifiable
Because the vault lives on the Bitcoin blockchain, anyone can verify collateral deposits and releases at any time. You do not have to trust a private ledger or take Coinedge's word for it — the on-chain record is public and permanent. Collateral is always confirmed on-chain before any USDC is released to the borrower.
What happens at repayment — and at default
When you repay the loan in full, all three key holders co-sign the release transaction and your Bitcoin returns to your wallet. If a borrower defaults, the coordination key is used only to execute the pre-agreed liquidation workflow — the terms set at loan origination, not a unilateral decision. The keys enforce the contract; they do not give any party discretionary control.
This security model is the foundation of everything Coinedge does. Read the full security architecture, learn how to borrow, or start a request on the borrow page.
