Breez and Turnkey remove custody risk for apps adding bitcoin
A new partnership between Breez and Turnkey allows large-scale backend applications to integrate non-custodial bitcoin and stablecoins, removing the regulatory and security burdens of holding customer funds.
Breez has partnered with Turnkey to enable backend-run applications to integrate non-custodial bitcoin without altering their existing server architecture. The collaboration targets a structural barrier that has kept many mainstream fintechs and neobanks from adopting digital assets at scale.
Large consumer applications typically operate from a centralized backend to manage millions of users. Under traditional models, integrating bitcoin into this architecture required the company to hold user private keys on its servers. That status turns the application into a custodian, exposing it to strict licensing requirements, legal liability, and the security burden of safeguarding a massive store of user funds.
The new model shifts key generation and storage into Turnkey’s secure enclaves, keeping the private keys completely out of reach of the application’s servers, Breez, and Turnkey itself. While the company’s backend retains a credential that governs permitted actions, the sole authority to move funds rests with the end user.
Users authenticate transactions using a registered passkey rather than a traditional seed phrase. When a server prepares a transaction—detailing the amount, fee, and destination—the user must explicitly approve it before the transfer completes. This maintains the standard user experience of a backend-run app while ensuring the server cannot initiate unauthorized spending.
The integration relies on Turnkey’s support for the Spark network, which underpins the Breez SDK. Combined with Breez’s server mode, the infrastructure allows a single backend to manage wallets for millions of users simultaneously without ever storing their keys. Turnkey currently provides embedded wallet infrastructure to consumer apps and holds a SOC 2 audit.
In a note to Bitcoin Magazine, Breez framed the release as a tool for "exchanges, fintechs, and neobanks to offer bitcoin and stablecoin services to large user bases without taking custody of funds." For financial institutions, this means exchanges can automate payouts within predefined security rules, while consumer fintechs can embed non-custodial bitcoin directly into their existing interfaces.
The partnership builds on recent Breez SDK updates designed to lower integration barriers. Previous additions include Passkey Login, a Stable Balance feature to mitigate price volatility, and support for sending USDT and USDC. Together, these tools allow backend products to offer bitcoin and stablecoins while ensuring asset custody remains entirely with the user.
