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A sealed Bitcoin bearer stick.

Load it. Verify it. Pass it. Break the seal to spend.

Opendime is a small USB stick that holds bitcoin as a sealed physical bearer instrument. Connect it to USB to check its address, balance, and sealed state. Pass the device hand to hand without an on-chain transaction. Break the seal only when you are ready to sweep the bitcoin into a wallet you control.

Multi-language interface: 中文 • 日本語 • English • Português • Français • Deutsch • Русский

One sealed lifecycle

Load it. Verify it. Pass it. Break the seal to spend.

The physical device carries control while it remains sealed. Funding it and sweeping it are Bitcoin transactions. Passing a sealed OPENDIME to another person is not.

  1. 01

    Load

    Connect it to USB, confirm the payment address, send bitcoin, and wait for the confirmations you require.

  2. 02

    Verify

    Check the address, balance, and sealed state yourself. A recipient should repeat these checks before accepting it.

  3. 03

    Pass

    Hand over the sealed device. The bitcoin does not move on-chain just because the OPENDIME changes hands.

  4. 04

    Unseal and sweep

    Push a pin through the marked hole to reveal the private key. This is irreversible. Sweep the full balance into a trusted wallet.

USB or NFC?

Choose the form that fits.

OPENDIMEOne sealed key on a USB bearer device.

SATSCARDTen sealed slots on a reusable NFC card.

Compare with SATSCARD

Watch more Opendime hardware wallet videos

How to use Opendime:

Packed with Features

  • USB Drive

    Acts like a read-only USB flash drive. Works with any computer, laptop, or phone. A QR Image and Text files inside contain Bitcoin address and helpful information.

  • Ultra Secure

    The private key is generated inside the device, and is never known to any human, not even you!

  • Compatibility

    The Bitcoin world changes fast but Opendime is built on the fundamental Bitcoin features that haven't changed in five years.

  • No Trust

    Give an Opendime to anyone and they don't need to worry that you can take back the funds later. The private key is strictly in the device itself.

  • Free To Use

    This is physical Bitcoin as it was meant to be: just hand it to someone and they've got it. Pass it on multiple times! As simple as a handshake. No miner fees, no confirmation delays.

  • Open Standards

    Uses Bitcoin message signing, normal (non HD) bitcoin payment addresses and private keys in WIF format.

OPENDIME payment address and private key files

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Decentralized Open Source Money

Bitcoin accepted here

Bitcoin is an innovative payment network and a new kind of money.

Easy Verification Chrome Plugin

OPENDIME Chrome extension verification screen

Installation instructions here.

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OPENDIME security features

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Real Security

  • Based on Private Keys

    Each Opendime holds one private key. It publishes the public key (payment address) to anyone and never reveals the key until "unsealed".

  • Piggy-Bank Economics !?

    Yes. It's like a piggy-bank. You must destroy it to spend the funds. At first that seems expensive and wasteful, but it's a key part of our security model: you can trust a sealed Opendime, and it's obvious when it's been opened.

  • Instant and Off-Chain

    Since we are putting private keys into a physical form you can trust, you can simply hand around Opendime units to move amounts around. There are no pre-defined Bitcoin amounts with Opendime either. Store as much or as little as needed.

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People Love Opendime

Why?

Since we joined the Bitcoin revolution in 2013, we've watched the growth of both physical Bitcoin "coins" and hardware wallets with interest. However, the existing options fall short of being a useful means to transact business. We built Opendime to be much more than a another hardware wallet or a physical bitcoin.

We feel that we've created whole new product category: disposable hardware wallets to be used as cash. We're really excited to see what people will do with this. Maybe we'll see whole new economies based on Opendime spring up! That might be a real godsend in some countries that struggle with limited network infrastructure and corrupt governmental systems.

This is just the beginning. We have no idea where it will go from here!

Get a few today so you can be there first!

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Sealed OPENDIME front Sealed OPENDIME back

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