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How WBTC WorksMint / Burn Mechanism

Mint/Burn Mechanism

The mint and burn process is the core mechanism that maintains WBTC’s 1:1 backing with Bitcoin. Every WBTC token is issued only after an equivalent amount of BTC has been deposited into custody, and every redeemed WBTC is permanently removed from circulation before the corresponding BTC is released.

The process involves three participants:

  • Users, who want to convert BTC into WBTC or redeem WBTC for BTC.
  • Merchants, regulated institutions that perform KYC/AML checks and act as intermediaries between users and the custodian.
  • The Custodian, which securely holds the underlying BTC reserves and is the only entity authorized to mint and release WBTC.

This separation of responsibilities creates a secure and auditable workflow while ensuring that all circulating WBTC remains fully backed.

WBTC mint and burn overview

Minting Process (Tokenization)

Minting increases the circulating supply of WBTC. End users do not interact directly with the custodian. Instead, they work through an approved merchant that handles regulatory compliance and submits the mint request.

The minting process follows these steps:

  1. A user requests WBTC from an approved merchant.
  2. The merchant completes the required KYC/AML checks and instructs the user to transfer BTC.
  3. The merchant submits a mint request to the custodian, specifying the amount of WBTC to be issued and the destination blockchain.
  4. The BTC is transferred to the custodian’s designated custody wallet.
  5. After the Bitcoin transaction receives six network confirmations, the custodian verifies receipt of the funds.
  6. The custodian mints an equivalent amount of WBTC and transfers it to the merchant.
  7. The merchant delivers the WBTC to the user.

Each newly minted WBTC is backed by one BTC held in custody, maintaining the protocol’s 1:1 reserve ratio.

Minting process diagram

Burning Process (Redemption)

Burning permanently removes WBTC from circulation and enables redemption of the underlying BTC. Similar to minting, redemptions are processed through approved merchants rather than directly with the custodian.

The redemption process follows these steps:

  1. A user submits a redemption request to an approved merchant.
  2. The merchant performs the required KYC/AML verification.
  3. The merchant transfers the WBTC to the burn contract and executes the burn transaction, permanently removing the tokens from circulation.
  4. The custodian waits for 25 confirmations on the Ethereum network to ensure the burn transaction is final.
  5. After verification, the custodian releases the equivalent amount of BTC from custody to the merchant’s designated Bitcoin address.
  6. The merchant settles the BTC with the user according to its redemption process.

Because WBTC is burned before BTC is released, the circulating supply always remains synchronized with the amount of Bitcoin held in custody.

Burning process diagram

Why This Design Matters

The mint and burn workflow provides strong operational safeguards while maintaining transparency.

  • Only approved merchants can request minting or burning.
  • The custodian is solely responsible for issuing and redeeming WBTC.
  • Every mint and burn event is recorded on-chain and can be independently verified.
  • The total circulating supply can always be reconciled against the BTC held in custody, ensuring every WBTC remains fully backed.
Custody & Security