BITHD

BITHD was a Chinese hardware wallet manufacturer that produced two self-custody devices: the BITHD Watch, a wearable form-factor device, and the BITHD Razor, a more conventional hardware wallet. Both ran open-source firmware derived from the Trezor architecture and communicated with companion apps via Bluetooth. The project launched its first firmware release in February 2018 and published both its firmware and hardware designs under open-source licenses.

The wallet operated as a self-custody device, meaning private keys were generated and stored entirely on the hardware and never exposed to connected computers or phones. Transaction signing happened on the device, with users verifying details on its built-in display before confirming. Bluetooth pairing with a mobile companion app was the primary method for initiating transactions.

BITHD supported a broad range of assets across its firmware lifetime. Core support covered Bitcoin, Litecoin, Dogecoin, Dash, Zcash, Decred, Bitcoin Cash, Bitcoin SV, Bitcoin Gold, DigiByte, Groestlcoin, Vertcoin, Monacoin, and Namecoin. Later firmware versions added Ethereum and EVM-compatible chains, TRON with TRC20 tokens including USDT, EOS, OMNI-layer tokens, and eCash.

Development activity continued through late 2022, with firmware v4.2.0 released in December of that year as the final update. The official website, bithd.com, went offline in April 2025, and the project appears to no longer be operational. The GitHub repositories remain publicly accessible, preserving the open-source firmware and hardware design files.