# Cold Wallet Simulator (CWS)

- Canonical: https://ysk.hk/products/ysk-cold-wallet-simulator
- This page: https://ysk.hk/en/products/ysk-cold-wallet-simulator
- Markdown: https://ysk.hk/en/products/ysk-cold-wallet-simulator.md
- Source (audit): https://github.com/yanshekki/ysk-cold-wallet-simulator/
- Play: https://play.google.com/store/apps/details?id=hk.ysk.cws
- Package: hk.ysk.cws
- Licence: Proprietary. All rights reserved. YSK Limited. Source is published for audit. Not MIT.
- Version: 1.1.0 (build 6). GitHub has no Release tag.
- Publisher: YSK Limited

Simulate hardware wallets on a phone for development and interoperability testing—do not hold real assets. This software is not a secure element, and it is not endorsed by Ledger, Trezor, or OneKey.

## Features

1. Simulate selected Ledger / Trezor / OneKey models (Bluetooth)
2. BIP39 / SLIP-39 secrets in OS secure storage
3. CWS Proxy presents the phone as USB HID (desktop wallet link)
4. QR air-gap export of accounts / descriptors (seed export needs confirm)
5. Multi-chain derivation and signing (see README chain list)
6. Seeds are not absolutely safe — see security notes

## Download

- Android: Google Play (hk.ysk.cws)
- iOS App Store: coming soon (no link)
- CWS Proxy macOS: coming soon (Mac App Store HID is not approved; no download link)
- Ubuntu / Windows: coming soon / build from source (no download URL)

## Models

- Ledger: Nano X, Flex, Stax, Nano Gen5 (BLE APDU)
- Trezor: Safe 7 (BLE THP)
- OneKey: Classic, Classic 1s, Pure, Touch, Pro (V1); Pro 2, Neo (V2) (BLE protobuf)
- OneKey Mini has no Bluetooth radio and is not simulated.

## Chain list

Bitcoin (legacy, nested SegWit, native SegWit, Taproot), Ethereum and EVM-style paths, Avalanche, Solana (Ledger and Phantom paths), Cosmos, Tron, XRP, Cardano, Polkadot, TON, Aptos, Sui, NEAR, Litecoin, Dogecoin, Stellar, Tezos, and BNB Beacon. The README is the chain list.

## Limits

Seeds are not absolutely safe. Do not hold real assets. The proxy does not filter APDUs. The Trezor-compatible bridge listens on local port 21325. GitHub has no Release tag.

## FAQ

Q: Can Cold Wallet Simulator hold real assets?
A: No. It is a simulator for development and interoperability testing. It is not a secure element, and it is not endorsed by Ledger, Trezor, or OneKey. Do not hold real assets.

Q: Is Cold Wallet Simulator open source or MIT?
A: No. The licence is proprietary, all rights reserved (YSK Limited). Source is published for audit. It is not MIT and it is not an open-source licence.

Q: Where do I download Cold Wallet Simulator?
A: Android is on Google Play (hk.ysk.cws). The iOS App Store listing is coming soon. This page has no App Store link. GitHub has no Release tag for this version.

Q: How do I get CWS Proxy?
A: macOS is coming soon (Mac App Store HID is not approved). Ubuntu and Windows are coming soon, or build from source. This page has no proxy download URL.

Q: Are seeds absolutely safe?
A: No. BIP39 or SLIP-39 secrets sit in OS secure storage, and seeds are not absolutely safe. See the security notes.

Q: Which hardware models does it simulate?
A: Selected Ledger, Trezor, and OneKey models over Bluetooth. OneKey Mini has no Bluetooth radio and is not simulated. The model list is on the product page and in the README.

Contact: WhatsApp +852 6160 4242 / email@ysk.hk