What OneMessage is NOT

OneMessage is not a cryptocurrency wallet, exchange, or custody service. It does not store, send, or manage cryptocurrency. It only delivers SMS messages that you write yourself.

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One Message — A simple way to prepare for the unexpected

If you self-custody crypto, you hold the keys yourself. That also means access can be lost if something unexpected happens.

With OneMessage, you can prepare a message for your family in advance.

Example:
“Open Carl Sagan’s Cosmos on the second shelf in the study.”

Your message is encrypted and stored securely in the cloud. If your phone does not check in before the timer ends, the SMS is sent automatically.

Important:
Never include private keys or seed phrases directly in the SMS body. SMS is not end-to-end encrypted. Use simple hints that only your family can understand.

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Safety Message — Daily peace of mind

For people who live alone or stay far from family.

If your phone has not been used for 12 hours, OneMessage can automatically send a safety SMS to a trusted contact. It is free once a week and works quietly in the background during normal phone use.

Useful for:
• People living alone
• Older family members living independently
• Adult children living abroad
• Crypto holders who want an extra safety layer

Why OneMessage

Cloud-based delivery
Your message is stored securely in the cloud, so delivery does not depend only on your phone.

Passive check-in
Using your phone normally resets the timer. No daily manual check-in is needed.

18 languages
Supports Korean, English, Japanese, Chinese, and more.

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Privacy & Security

• Messages are encrypted at rest
• Recipient information is protected until delivery
• You can edit or delete your message at any time

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Your crypto plan. Your message. Prepared in advance.

Download OneMessage and set up your first message in minutes.