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Denarium logo.png

Denarium is a Physical Bitcoin coin manufacturer. Denarium produces easy, handy and secure bitcoin wallets in coin form. The private key is stored under a security seal without password protection. Denarium also offers a trustless multisignature coins, which eliminates the need to trust the manufacturer. Denarium is operated by Praos Oy. In addition to Denarium, Prasos also operates the Finnish bitcoin broker, one of the largest Bitcoin ATM network in the Nordics, called Bittimaatti and the leading European bitcoin exchange platform Coinmotion.

The Coin

The coin itself is a quality brass, bronze, silver or gold offline bitcoin wallet that we produce in Finland. The initial focus of Denarium Bitcoin was affordability and security. Along the way, however, we have created 13 different models ranging from very affordable to very luxury secure physical bitcoins.



Exploded view of a Denarium coin

The hologram is a high-quality custom-made security seal which is produced in Canada in a specialized high-security facility. It functions as an added layer of security for the protection of the private key. The hologram significantly increases anti-fraud security making it extremely difficult to counterfeit without leaving any visible marks.

The holograms are labeled individually in distinct series, the E-series and the L-series. The E-series are sold as empty, meaning they are not loaded with bitcoins, and the customer can autonomously load a desired amount of bitcoins to the coin. The L-series are sold as loaded meaning they contain a set amount of bitcoins, but the customer can still autonomously load more bitcoins to the coin. The hologram has a “window” where a portion of the public Bitcoin address of the coin can be read for checking balance and loading bitcoins to the coin.

Private key

All of our coins have a Bitcoin private key inside the coin. We use a 30-character mini private key format. Each private key is printed only once and for security reasons each phase of product assembly that involves the handling of private keys is directly supervised either by Henry Brade (CEO) or Viljami Räisä (CPO), or both.

To make redeeming the bitcoins inside easier, we print the key not only as plain text but also as a QR code. Modern smartphones are capable of scanning the QR code inside and importing the key directly to a Bitcoin wallet such as Mycelium.


Denarium Activation

To prioritize security Denarium has built an activation system with which you can manually verify a coin for bitcoin use. Customers receive a shipment code and email code. Combined they give access to the activation system. Activation It is an extra check done by the customer to verify that the coin is in good condition before loading the coins with bitcoin. It is important that the hologram has not been tampered with during shipping and worthwhile to make an extra check to verify that. Coins that are bought loaded from Denarium will only be loaded after activation. Empty coins can always be loaded with bitcoin, activation for empty coins merely functions as an extra check.

Denarium Explorer

Denarium Explorer is a public database where you can look up every Denarium coin ever produced. This information in the database is intended to help coin owners track their Bitcoin balance and equivalent in Euro easily. Next to this find other helpful coin information such as your coin's Bitcoin address, Initial denomination, Product code, Production batch, Manufacturing date and time, Activation status, Public key, and transaction history. In this way, customers are always up to date on their Bitcoin balance.


Denarium Production chart

To be transparent Denarium makes charts. From the charts, you can learn when and how much coins Denarium has produced and how much BTC is stored in total on Denarium coins. We use this charts to gain helpful information to keep track on our production and on how Bitcoin events, like forks, affect Denarium's bitcoin storage.