Token Bridging Model - Lock-Mint
SupraNova’s initial asset bridging uses the Lock-Mint model, a secure method that preserves the total supply of assets across chains while ensuring collateralization.
What is the Lock-Mint Bridging Model?
In a Lock-Mint model:
The asset on the source chain (Ethereum) is locked securely in a vault contract.
A wrapped equivalent token is minted on the destination chain (Supra).
There is no destruction, burning, or movement of tokens between chains.
Instead:
Original tokens remain locked.
Wrapped tokens represent a claim on the locked original.
The minting only occurs after proof verification by HyperNovaCore on Supra.
How Lock-Mint Works in SupraNova
User initiates a bridge request locking ETH into HyperNovaCore (Ethereum)
Relayer submits proofs verifying the lock event
Supra’s HyperNovaCore verifier validates the proofs
The Token Bridge Service Contract mints equivalent wrapped ETH (wETH) on Supra to the recipient address
Example Flow
You bridge 5 ETH from Ethereum.
SupraNova locks exactly 5 ETH in the Ethereum bridge vault.
After proof validation, Supra mints the equivalent amount of wETH to your wallet, minus any applicable service fee.
In the current testnet release, fee deductions may be waived or minimal.
Collateral Status:
ETH remains locked securely in Ethereum contracts.
wETH is fully backed 1:1 by real ETH.
Security Guarantees
No Double Spending: Because ETH remains immobile once locked.
Full Collateralization: wETH minted on Supra cannot exceed ETH locked on Ethereum.
Proof-Driven Minting: No minting happens without complete proof validation across transaction, receipt, and consensus.
Why is Lock-Mint chosen?
SupraNova chose Lock-Mint because:
It is simple and verifiable.
It aligns perfectly with Supra’s trustless, proof-based validation model.
It avoids complexities like token burns, which are harder to verify without replay attacks or external watchdogs.
Supported Asset in Initial Release
Source Token
Destination Token
Model
ETH (Ethereum native asset)
wETH (Supra FA standard)
Lock-Mint
You cannot unlock ETH back to Ethereum yet in this release.
Supra → Ethereum (burn-unlock model) will be added in a future HyperNova reverse bridge upgrade.
Future Transfer Models
SupraNova currently uses a Lock-Mint bridging model where original assets are locked on the source chain and mirrored on Supra through minting.
In future versions, the bridge will also support:
Burn-Release: Users will burn wrapped tokens on Supra, which will trigger the release of locked assets back to the source chain.
Burn-Mint: Burning wrapped assets on Supra to mint another representation on a different destination chain.
These additional modes will allow Supra to offer both one-way and bi-directional bridging based on user needs and liquidity dynamics.
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