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Silent Node
Unisex tee · XS–3XL
$39.99
Hover to zoomO Christmas Block Bitcoin T-Shirt
$39.99
A Christmas tree stacked from orange blocks, like a tiny blockchain with a star on top, over O CHRISTMAS BLOCK.
- Unisex tailored fit, sizes XS–3XL
- Free US shipping over $75, $4.99 below
- 30-day size exchanges on unworn tees
About this design
An orange outline Christmas tree built from square blocks stacked in rows of three, two and one, standing on a single block trunk and topped with a five-point star, sits above O CHRISTMAS in white capitals and a larger BLOCK below.
Fabric, fit & print
| Material | Airlume combed & ring-spun cotton |
|---|---|
| Fit | Unisex tailored crew neck |
| Printed to order | |
| Sizes | XS, S, M, L, XL, 2XL, 3XL |
| SKU | BC-XMASBLK |
Shipping & exchanges
Ships in 3–4 business days, tracked. See the shipping policy and returns & exchanges.
The story
Behind the O Christmas Block tee
Every bitcoin block sits on top of the one before it, which makes a Christmas tree surprisingly easy to build. This tee turns a classic carol into a blockchain joke.
The pun comes from O Tannenbaum, a German folk song whose best-known lyrics were written by Ernst Anschütz in 1824 and which English speakers sing as O Christmas Tree. In bitcoin, a block is a bundle of confirmed transactions, and each new one is stacked on the previous block, forming the chain that gives blockchain its name. Draw that stack in the shape of a tree, put a star on top, and the carol practically rewrites itself. The tune has been in the public domain for generations.
Ideal for a tech team's holiday party, a December hackathon or a family dinner with one curious engineer. The block tree is clever without being loud, and the two lines of type are short enough to read across the room. Developers and puzzle fans tend to get it first.
Questions
About this design
How much extra time do Alaska and Hawaii orders need before Christmas?
Plan on about 2 weeks of delivery time for Alaska, Hawaii, Puerto Rico and US territories, on top of the usual 3 to 4 business days to print and ship. Continental US addresses usually take about 5 days after shipping. These are typical times, not guarantees.
Why is the tree made of square blocks?
A bitcoin blockchain is literally blocks stacked one on another, each pointing back to the one before it. Building the tree from squares turns that structure into a holiday decoration, and you could call the star on top the newest block in the stack.
Do you need to know how a blockchain works to enjoy this shirt?
Not at all. Anyone who knows the carol will smile at the swap of tree for block, and the stacked-square tree looks festive on its own. Bitcoiners simply get a second layer: each square is a block, and the chain grows one at a time.
Keep stacking
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