NUMISATO — The Physical Bitcoin Archive
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TBA-0001 · Preview record

Casascius
1 Bitcoin · Brass

An early physical expression of Bitcoin, pairing a brass coin with a concealed key. This record covers the 2011 brass issue; hologram variants require separate identification.

Casascius 2011 brass one bitcoin, front
Obverse · dated 2011Photo: Tiberiandusk · Original source · CC BY-SA 4.0. Unmodified Wikimedia thumbnail; address obscuration is present in the source.
Casascius 2011 brass one bitcoin, hologram reverse; address obscured in source photograph
Reverse · typo hologramPhoto: Tiberiandusk · Original source · CC BY-SA 4.0. Unmodified Wikimedia thumbnail; address obscuration is present in the source.

Documented details

Year
2011
Material
Brass
Denomination
1 BTC
Weight
¼ oz (maker specification)
Diameter
28.6 mm
Mintage
Not established

Identification notes

This record covers the 2011 brass issue, not one individually authenticated specimen. The photographed reverse is identified by its contributor as the typo-hologram variety. Photograph availability does not establish funding status.

2011 brass example. Reverse photograph shows a typo hologram; the address was obscured by the original image contributor.

Sources

Record reviewed: 12 October 2026. Information remains provisional.

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