# Key Processes

### BTC Deposit and SolvBTC Minting

The minting process begins when a user deposits BTC into a protocol-managed Bitcoin address and concludes when SolvBTC is minted to the user’s EVM address.

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#### Step 1: BTC Deposit

* The user is assigned a Bitcoin deposit address managed by the protocol
* The user transfers BTC to the assigned address
* The transaction is recorded on the Bitcoin network

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#### Step 2: Deposit Detection and Confirmation

* The Indexer continuously scans the Bitcoin blockchain
* Transactions sent to Vault Pool addresses are detected
* Confirmation counts are tracked until the deposit reaches the required finality

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#### Step 3: Mint Request Assembly

* Once confirmed, the Indexer assembles a Mint request
* The request includes:
  * Bitcoin transaction hash
  * Deposit amount
  * Block height
  * Target EVM address

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#### Step 4: Approval Workflow

* The Mint request is submitted for approval
* The approval workflow evaluates the request according to current policy
* Upon approval, the request becomes eligible for execution

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#### Step 5: SolvBTC Mint Execution

* The approved request is processed by the Mint contract
* The SolvBTC supply is updated
* SolvBTC is minted and assigned to the user’s EVM address

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### SolvBTC Burn and BTC Redemption

The redemption process begins when a user burns SolvBTC on an EVM-compatible chain and concludes when BTC is transferred to the user’s specified Bitcoin address.

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#### Step 1: Burn Initiation

* The user calls the Burn function on the SolvBTC contract
* The user specifies a Bitcoin receiving address
* The corresponding amount of SolvBTC is burned

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#### Step 2: Burn Event Detection

* The Burn contract emits an event containing redemption parameters
* The Indexer monitors the EVM chain and captures the Burn event

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#### Step 3: Redemption Request Assembly

* The Indexer assembles a redemption request
* The request includes:
  * Burn transaction reference
  * Redemption amount
  * Bitcoin receiving address

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#### Step 4: Approval Workflow

* The redemption request is submitted for approval
* The approval workflow evaluates the request according to current policy
* Upon approval, the request becomes eligible for execution

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#### Step 5: BTC Transfer Execution

* The approved request is forwarded to the FROST Network
* The FROST Network constructs the corresponding Bitcoin transaction
* Threshold signing is performed using signing secret shares
* The signed transaction is broadcast to the Bitcoin network

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### Operational Characteristics

* All protocol operations are driven by onchain events and confirmed blockchain state
* Approval workflows provide a controlled transition between observation and execution
* Bitcoin transaction execution is performed through distributed threshold signing

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