# Onchain Smart Contracts

SolvBTC deploys smart contracts on Ethereum and other EVM-compatible chains to manage SolvBTC minting and burning.

#### Mint Contract

When the Indexer detects and validates a confirmed deposit, it submits a Mint request to the contract.

* Mint requests include the Bitcoin transaction reference and the target EVM address
* The contract processes the request and updates the SolvBTC supply
* Minted SolvBTC is assigned to the user’s address

Different deposit amounts may follow different processing paths.

#### Burn Contract

When a user initiates redemption by burning SolvBTC, the Burn contract processes the request.

* The user calls the Burn function and specifies a Bitcoin receiving address
* The contract burns the corresponding amount of SolvBTC
* A Burn event is emitted with redemption parameters
* Subsequent BTC transfer processing continues offchain

#### Governance and Contract Control

The SolvBTC protocol applies governance mechanisms to control critical onchain contract operations. Governance is scoped according to the **nature and impact of the operation**, rather than enforced through a single uniform model.

* **Execution-level operations**, such as minting and burning, are primarily constrained by onchain contract logic and predefined execution rules. Certain execution paths additionally rely on approval workflows described in the Auditors section.
* **Protocol-level operations**, including contract upgrades and parameter changes, are governed through broader and more deliberate governance processes. These actions are infrequent and may involve expanded participation, time-delayed execution, or community-based decision mechanisms.

For details on governance mechanisms such as multisig control and timelock configurations, see the Smart Contract Governance page under Security.<br>


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