SBK (Split Bitcoin Keys) is free, open-source software for creating and recovering self-custodied Bitcoin wallet keys. Its goal is to make Bitcoin’s “Your keys, your coins” principle safer and more practical. It is important to stress that the documentation clearly states SBK is not yet ready for ordinary users and should currently be used only in development and testing scenarios. Any wallet generated with SBK should be assumed to be a potential “black hole” where any Bitcoin sent to it may become unrecoverable.
SBK is not an exchange, DeFi product, or custodial wallet. It is a self-custody key-management tool. Its core mechanism uses two types of secrets: Brainkeys, which are secrets memorized only by the user, not written down elsewhere, and impossible to guess; and Backup Shares, which are distributed backups based on Shamir's Secret Sharing. The design aims to keep the wallet secure even if a single backup is lost, stolen, or copied by hackers, while also giving family members a chance to recover assets if something happens to the user. The project also provides a Live Distribution ISO, USB/DVD boot guides, and paper and metal backup templates.
SBK is free and open source, with its source code published on GitHub. The documentation does not mention subscriptions, transaction fees, or commercial services. Its supported scope is explicitly limited to Bitcoin. There are no trading pairs, fiat on/off ramps, leverage or derivatives features, and no information about a KYC process. It is not a trading platform, but a tool focused on secure backup and recovery of Bitcoin private keys.
Its advantages are that it is open source, free, and focused on self-custody and distributed backups. In theory, it can reduce single-point-of-failure risk more effectively than simply writing a 12-word seed phrase on paper. The drawbacks are equally clear: the project is still in the testing stage, comes with no guarantees, and the author does not compensate users for financial losses. It is also not a substitute for multisig. Residual risks include attackers coercing the user into revealing the brainkey, collecting enough backup shares, or installing a hardware keylogger through physical access to the user’s computer.
SBK is better suited to developers, security researchers, evaluators of Bitcoin self-custody solutions, and people interested in studying distributed key backup. Ordinary users should not use it to store real Bitcoin. The documentation provides no information about accessibility from China, so this remains unknown. It also does not involve fiat payment rails. For practical long-term asset custody, more realistic alternatives include mature hardware wallets, multisig wallets, or thoroughly validated cold-backup solutions for seed phrases.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on sbk.dev official site.
sbk.dev is an Unknown Crypto provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach sbk.dev directly.