[Wallets](https://revain.org/wallets/) › Keystone

# 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

## Key facts

- **Official site**: [keyst.one](https://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](https://keyst.one/)
- Source code: [github.com/KeystoneHQ/keystone3-firmware](https://github.com/KeystoneHQ/keystone3-firmware)
- Security: [keyst.one/bug-bounty-program](https://keyst.one/bug-bounty-program)
- Docs: [guide.keyst.one](https://guide.keyst.one/)
- Download: [keyst.one/firmware](https://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](https://keyst.one/)
- [Keystone — About us](https://keyst.one/about-us)
- [Keystone — Open source](https://keyst.one/open-source)
- [Keystone — Bug bounty program](https://keyst.one/bug-bounty-program)
- [Keystone — Terms of use](https://keyst.one/terms-of-conditions)
- [Keystone — Supported wallets and assets](https://keyst.one/supported-wallets-and-assets)
- [Keystone — BTC-only](https://keyst.one/btc-only)
- [Keystone — Shipping regions](https://keyst.one/shipping-regions)
- [GitHub — KeystoneHQ/keystone3-firmware](https://github.com/KeystoneHQ/keystone3-firmware)
- [GitHub — keystone3-firmware LICENSE](https://github.com/KeystoneHQ/keystone3-firmware/blob/master/LICENSE)
- [GitHub — keystone3-firmware CHANGELOG](https://github.com/KeystoneHQ/keystone3-firmware/blob/master/CHANGELOG.md)

## More in this section

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- [All Wallets →](https://revain.org/wallets/)

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Page updated: 2026-10-31

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Source: https://revain.org/wallets/keystone/