Casascius Bitcoin History: Physical Coins, Keys, and Custody
The metal was a container for an on-chain balance, so loaded, redeemed, and unfunded pieces tell different stories.
2011 origin • sealed private key • 2013 funded-sales pause • collector custody
What were Casascius Bitcoins?
Casascius Bitcoins were physical collectible coins and rounds created by Mike Caldwell beginning in 2011. A funded piece was tied to a unique Bitcoin address, with its private key printed on a card sealed beneath a tamper-evident hologram. The coin did not create a new kind of money: the balance remained Bitcoin on the public ledger, while the metal carried the information needed to spend it. Some pieces were sold or discussed as unfunded containers, and a redeemed coin had its key exposed or its balance moved.
A Bitcoin wallet you could hold in your hand
Casascius joined a familiar object to Bitcoin's unfamiliar key model. Its history is easiest to understand by separating the coin, the hologram, the private key, and the balance recorded by the network.
The metal was the container, not the currency
The Bitcoin lived at an address in the public blockchain. The coin carried the corresponding private key on an embedded card, giving the bearer a physical way to hold and transfer access to an existing balance.
The hologram was a tamper-evident signal
Casascius described a hologram that left a visible honeycomb pattern when peeled. That helped a recipient notice opening, but an intact seal was not a mathematical proof of authenticity, funding, or hidden-key security.
Funding was an ordinary Bitcoin transaction
Caldwell's controls described tracking addresses and sending Bitcoin to them in batches. A funding transaction moved existing coins on-chain; it did not make a new token inside the brass or silver object.
Collecting and spending pulled in opposite directions
Keeping the hologram intact preserved the sealed physical object and its provenance story. Redeeming prioritized access to the balance, but exposed the key and changed the object's state.
Physical custody added physical failure modes
Loss, theft, fire, water, abrasion, tampering, and counterfeit packaging could all complicate custody. Casascius's own terms warned that a lost or damaged coin could not be replaced or re-issued.
From proof of concept to funded-sales pause
The important distinction in this timeline is between making a physical container and funding it with Bitcoin. The 2013 pause concerned sales of items containing digital bitcoins, while later first-party statements discussed unfunded and aluminum products.
The first public coverage
CNET reports on Casascius physical Bitcoins and identifies Mike Caldwell, a creator in Utah, as the maker. Casascius's own FAQ says the coins were featured near the end of October 2011, placing the public origin of the project in that period.
The original series takes shape
Caldwell's FAQ says about 3,500 original-series pieces had been made by December 2011 and that there would never be more than 11,000 of that series. His later Statement of Controls describes 11,000 generated addresses, offline key generation, one-copy paper handling, hologram assembly, and publication of the Series 1 address list. These are Caldwell's documented production controls; an address set is not the same thing as 11,000 surviving or funded coins, and the controls are not an independent audit of every individual piece.
FinCEN clarifies virtual-currency roles
FinCEN's FIN-2013-G001 guidance says a user of convertible virtual currency is not an MSB merely for using it, while an administrator or exchanger is generally a money transmitter unless a limitation or exemption applies. The guidance sets out a regulatory framework; it is not a blanket statement that manufacturing every physical representation is banned.
Funding continues after the guidance
In a contemporary blog post, Caldwell announced the first funding of the 2013 silver coins and described a batch transaction with 1,295 outputs. This record matters because it places continued funding after the March guidance and before the later pause.
Sales of items containing Bitcoin are suspended
The Casascius homepage states that, as of November 27, 2013, sales of items containing digital bitcoins were suspended and that current items for sale did not contain bitcoins. This is a documented pause in funded-item sales, not proof that every physical coin or blank container stopped being made.
Caldwell explains the order pause
The next-day post on Caldwell's Casascius blog says new orders were suspended while he resolved regulatory concerns and considered whether buyers might need prequalification. It also says the pause would not affect past orders; it does not claim that all physical coin production was prohibited.
Unfunded and aluminum products are discussed
Caldwell later wrote that aluminum coins and unfunded 2014 coins could resume, describing the latter as empty private-key wallets inside coin containers. He also discussed the possibility of limited face-to-face funded sales in Utah. That follow-up is why the historical record should be described as a restriction or pause on general funded sales, not a universal manufacturing ban.
Who and what made the coins work
The project sat at the intersection of a maker, a cryptographic key, and a public ledger.
Mike Caldwell (Casascius)
The Utah maker behind the project. His first-party FAQ describes the original coins as a proof of concept and conversation piece, while his controls document how keys, holograms, addresses, and funding were handled.
The Bitcoin public ledger
The network recorded the balance at each coin's address. The coin's metal never contained the ledger entry; the private key only authorized a transaction that could move the balance.
FinCEN's 2013 framework
The March 2013 guidance supplied the user, administrator, and exchanger categories that shaped the regulatory discussion. It should be read as guidance about activities and facts, not as a universal ruling on every physical coin design.
Casascius by the dates and counts
These figures come from contemporary first-party statements and identify what each number actually measures.
Public origin
2011
CNET coverage and Caldwell's FAQ place the first public Casascius period in late October 2011.
Original-series address set
11,000
The Statement of Controls says 11,000 Series 1 addresses were generated; this was a key set, not a count of all coins sold or still loaded.
Reported by December 2011
About 3,500
Caldwell's FAQ says about 3,500 original-series pieces had been made by that month.
Funded-item sales pause
Nov 27, 2013
The Casascius homepage dates the suspension of sales of items containing digital bitcoins to November 27, 2013.
Questions about Casascius Bitcoins
The short answers distinguish the physical object, the private key, and the Bitcoin balance on the ledger.
Who created Casascius Bitcoins, and when?
Mike Caldwell created the project in Utah. A CNET report dated October 25, 2011 and Caldwell's own FAQ place the first public Casascius period in late 2011.
What does a loaded Casascius coin mean?
It means Bitcoin was sent to the unique address associated with the coin and remained unspent. The value was on the public ledger; the coin carried the private key needed to authorize a spend.
What is a redeemed Casascius coin?
Redeeming normally means opening the hologram or otherwise exposing and importing the private key so the balance can be moved. The metal object can remain as a collectible, but its original sealed state is gone and the ledger must be checked separately.
What is an unfunded Casascius coin?
It is a physical container with an address and key but no Bitcoin sent to that address yet. Caldwell's January 2014 post described unfunded coins as empty private-key wallets inside coin containers.
Did a Casascius coin create a new Bitcoin?
No. Funding was an ordinary Bitcoin transaction to the coin's address. The physical piece was a way to carry key material and a visible object, not a new token or a separate blockchain.
Did FinCEN ban physical Bitcoin coins in 2013?
The March 18, 2013 FinCEN guidance did not announce a blanket ban on physical representations. It explained when users, administrators, and exchangers may fall under money-transmitter rules. Caldwell later paused new orders and sales of funded items while citing regulatory concerns, then discussed unfunded and aluminum products. The guidance does not decide every business's legal status.
Does an intact hologram prove that a coin is funded and authentic?
No. The hologram was designed to make opening visible, and the address can be checked against the ledger, but Casascius's own terms warn about tampering, counterfeit items, and the limits of physical security.
Why would a collector keep a coin sealed?
A sealed piece preserves the original physical state, the maker's production story, and the visual evidence that the key compartment has not been opened. Redeeming the balance is a different choice that exposes the key and changes that state.