Keystone: keys, security, fees and reviews
In short
- Key control
- Non-custodial: private keys and recovery phrases stay on the device; Keystone has no access to them.
- Fees
- Wallet: No subscription; the device is bought once from the official shop or resellers. Network fees are paid through the companion software wallet.
- Risks and caveats
- Keystone cannot recover keys or recovery phrases; losing the seed phrase backup means losing access to funds.
- Checked
- 31 October 2026
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Key facts
- Official site
- keyst.one
Key facts checked on 31 October 2026 against official sources.
What is Keystone
Keystone is an air-gapped hardware wallet brand operated by Yanssie HK Limited in Hong Kong, active since 2018. The current Keystone 3 Pro has a 4-inch touchscreen, a fingerprint sensor and three secure elements, signs transactions offline and exchanges data with software wallets such as MetaMask and OKX Wallet via QR codes.
Who holds the keys
| Parameter | Details |
|---|---|
| Key control | Non-custodial: private keys and recovery phrases stay on the device; Keystone has no access to them. |
| Seed phrase | Recovery phrases are generated or imported inside the device; transactions are signed with keys stored on it. |
| Account model | Up to three seed phrases on one device. |
Features and supported networks
| Parameter | Details |
|---|---|
| Connectivity | Air-gapped: no Bluetooth; transactions pass through QR codes read by the built-in camera. |
| Secure element | Three secure elements (Microchip DS28C50, Maxim MAX32520, Microchip ATECC608A) next to an MH1903 MCU; PCI-grade tamper resistance with self-destruct. |
| Display | 4-inch full-colour touchscreen with fingerprint verification. |
| Supported networks | Multi-coin firmware (BTC, ETH and EVM chains, Solana, TRON, Cardano, Zcash and others) or a separate Bitcoin-only firmware. |
| Software wallet support | Works with MetaMask, OKX Wallet and 100+ other Web3 wallets as companion apps. |
| Multisig | Bitcoin multisig across wallets from different manufacturers. |
Security and audits
- The Keystone 3 firmware is public on GitHub (KeystoneHQ/keystone3-firmware) under the MIT licence from Yanssie HK Limited; hardware schematics, BOM and a reproducible-build verification guide are published.
- Some third-party MCU libraries (MH1903) are included only as pre-compiled vendor code and are not open source.
- Keystone runs a bug bounty for its hardware and firmware that requires a working proof of concept on a real device.
Security incidents
Further incidents are reported by third parties (press, incident databases) but are not confirmed in the company’s own channels, so they are not listed here.
Fees
| Parameter | Details |
|---|---|
| Wallet | No subscription; the device is bought once from the official shop or resellers. Network fees are paid through the companion software wallet. |
History
| Date | Event |
|---|---|
| 2018 | Keystone team began building self-custody hardware. |
| 26 September 2023 | Keystone 3 firmware version 1.0.0 released, adding Cosmos support and passphrase. |
| 21 October 2026 | Keystone 3 firmware version 3.2.0 released. |
Risks and caveats
- Keystone cannot recover keys or recovery phrases; losing the seed phrase backup means losing access to funds.
- Transactions are broadcast through third-party software wallets, whose own risks apply.
- Users must be at least 18 years old to use the services.
About the developer
- Legal entity
- Yanssie HK Limited, a Hong Kong-registered company.
- Headquarters
- 19H Maxgrand Plaza, 3 Tai Yau Street, San Po Kong, Kowloon, Hong Kong.
- Founded
- 2018
- Founders
- CTO Aaron Chen contributed to Bitcoin standard BIP-129 (multisig wallet setup).
Official links
- Website: keyst.one
- Source code: github.com/KeystoneHQ/keystone3-firmware
- Security: keyst.one/bug-bounty-program
- Docs: guide.keyst.one
- Download: keyst.one/firmware
Questions and answers
Is Keystone self-custodial?
Yes. Keys and recovery phrases are created and stored on the device, and Keystone has no access to them.
Is Keystone open source?
The Keystone 3 firmware is on GitHub under the MIT licence, with schematics and a build-verification guide; some third-party MCU libraries are closed.
How does Keystone connect to a phone or computer?
It is air-gapped: it has no Bluetooth and exchanges transactions through QR codes with wallets such as MetaMask and OKX Wallet.
Which coins does Keystone support?
Bitcoin, Ethereum and EVM chains, Solana, TRON, Cardano, Zcash and more on the multi-coin firmware; a Bitcoin-only firmware is also offered.
Who makes Keystone?
Yanssie HK Limited, a Hong Kong-registered company, which has operated the brand since 2018.
Sources
- Keystone — Home
- Keystone — About us
- Keystone — Open source
- Keystone — Bug bounty program
- Keystone — Terms of use
- Keystone — Supported wallets and assets
- Keystone — BTC-only
- Keystone — Shipping regions
- GitHub — KeystoneHQ/keystone3-firmware
- GitHub — keystone3-firmware LICENSE
- GitHub — keystone3-firmware CHANGELOG
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