Most wallets rely on a single private key to control your assets. This creates a major risk: anyone who gets access to that key can take your assets.
Bron uses MPC (Multi-Party Computation) to keep your wallet secure — without a private key. Instead, it generates three separate pieces, called shards, stored in different places. No one person or device ever has full access to all three shards simultaneously. This means even if one shard is compromised, your wallet remains secure.
1. How it works
Bron’s MPC implementation enables keyless wallet creation with institutional-grade security.
When a wallet is created, a public address and three shards are generated.
No private key is ever created or stored.
Two out of three shards are required to authorize a blockchain transaction.
To compromise a wallet, two shards must be compromised at the same time.
Every account in your Bron workspace uses a unique set of shards.
2. Shard Distribution
Shard 1 — Held by you.
Shard 2 — Managed by Bron.
Shard 3 — Held by a Trusted Third Party, contracted on your behalf.
All shards are encrypted. This ensures that even if a shard is misplaced, it cannot be used or read without proper authorisation.
3. Trusted Third Party
Why is a Trusted Third Party needed?
A Trusted Third Party (TTP) is an essential part of Bron’s security and recovery model. It ensures that you can regain access to your wallet — even if Bron becomes unavailable. Today, Bron’s Trusted Third Party is Qrypt.
If that happens, you can recover your keys without Bron. On your trusted device — which holds your own shard (Shard 1) — you generate a recovery request and send it to the TTP. After verifying your identity, the TTP returns a response created from the shard it holds (Shard 3), and your device combines the two shards to rebuild your signing key. This runs entirely offline and does not require Bron’s servers or Bron’s shard, so you stay in control of your assets even if Bron is permanently unavailable. For the full step-by-step, see Private Key Recovery for use ONLY if Bron shuts down permanently.
The TTP is an independent company that specializes in secure cryptographic storage. It is:
Selected for expertise in secure data infrastructure.
Independent — not part of Bron’s daily operations.
Non-intrusive — it cannot access your assets or sign transactions unless explicitly authorized in recovery scenarios.
From the moment your wallet is created, the third shard is securely held by the TTP.
4. How the Shards Work in Practice
Daily Operations
Your shard (1) + Bron’s shard (2) are used for normal transaction signing.
When you initiate a transaction, your shard signs first.
Bron then signs automatically — it never initiates transactions or exercises discretion. It simply executes your instruction.
Disaster Recovery
If access to your shard or Bron’s shard is lost, the remaining two shards restore access. While Bron is available, Bron’s shard (2) and the TTP’s shard (3) can rebuild a lost device shard.
If Bron itself is permanently unavailable, your device shard (1) and the TTP’s shard (3) rebuild your signing key offline — Bron is not involved.
In every recovery event, the process only proceeds after your identity is verified, and the two available parties collaborate to reconstruct the missing shard.
This setup ensures that your assets remain secure, recoverable, and in your control — even if one party is compromised or goes offline.
¹ Bron-held shard is used only under your instruction for signing and recovery. A private key is never created or stored.
If you have questions, contact our support team via messenger on the Bron platform or by email support@bron.org.