Bitcoin Formula T-shirt

$30.00

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Taxes included. Shipping calculated at checkout.

Quantity

Size guide

Centimeters

Size Label	Length (A)	Width (B)	Sleeve length (C)
S	69	49.5	22.5
M	73	53.5	24
L	75	56.5	24.5
XL	77	59.5	25
2XL	79	63.5	25.5
3XL	81	67.5	26
4XL	83	72.5	26
5XL	84	77.5	26

Inches

Size Label	Length (A)	Width (B)	Sleeve length (C)
S	27 ⅛	19 ½	8 ⅞
M	28 ¾	21	9 ½
L	29 ½	22 ¼	9 ⅝
XL	30 ¼	23 ⅜	9 ⅞
2XL	31 ⅛	25	10
3XL	31 ⅞	26 ⅝	10 ¼
4XL	32 ⅝	28 ½	10 ¼
5XL	33 ⅛	30 ½	10 ¼

product-measurements

This is a t-shirt with the cool correct Bitcoin scarcity formula made by @Therationalroot. This T-shirt works very well to start an exciting conversation! This formula represents Bitcoin’s supply distribution schedule as defined by the Bitcoin protocol accurate down to the Satoshi! Read more about the formula below.

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About the formula

A Satoshi, named after its creator, is the smallest unit of a Bitcoin. One Bitcoin equals 100 million Satoshi’s. The formula = 2,099,999,997,690,000 Satoshi’s. Which divided by 100 million is slightly less than 21 million Bitcoin. This symbol ∑ (called Sigma) means "sum up", it sums up whatever is followed with the variable i=0 to i=32. This variable represents the 32 Halvings in Bitcoin, where the supply that is mined will be cut in half. The number 210,000 is the amount of blocks in each Halving. The number 50 is the initial amount of Bitcoin being mined per block. We times this by 10^8 to get the amount of Satoshi’s. The brackets aren’t actually brackets but a floor function. Since a Satoshi is the smallest unit of a Bitcoin, we need to round off down to whole Satoshis. This is the reason why there are slightly less than 21 million Bitcoin.

Frequently asked questions

Can 21mil ship worldwide?

Yes absolutely, 21mil can ship almost to any country. We do not ship to some countries due to legal or carrier restrictions.

We do not ship to the following destinations:

Crimea, Luhansk and Donetsk regions in Ukraine
Russia
Belarus
Gaza Strip in Palestine
Ecuador
Cuba
Iran
Syria
North Korea

Does 21mil offer free shipping?

Yes we offer free shipping for orders over $100.

Can I pay with Bitcoin?

Yes, you can pay with Bitcoin. We accept both on-chain transactions and Lightning payments. During checkout, select the Bitcoin payment option. We prefer Bitcoin payments!

Does 21mil have discounts or promotions?

Occasionally, we offer promotions. If you want to stay informed, the best way is to subscribe to our emails. Subscribers are always the first to receive discounts and special offers directly in their inbox.

Can I return or exchange an item?

Yes, absolutely! You can return or exchange a product within 14 days of purchase. However, the return shipping costs are the responsibility of the customer. Please contact us if you wish to exchange or return a product.

Pictures of happy customers

Dylan Leclair wearing a Bitcoin Formula T-shirt

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Bitcoin Formula T-shirt