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Bitcoin v0.1, Jan 2009
Unisex tee · XS–3XL
$39.99
Bitcoin Birthday Block.
Every day since January 3, 2009 has a Bitcoin block mined on it. Pick your birthday, an anniversary or any date and see which block was found at that moment.
What your birthday block means
A Bitcoin block is a page in the shared ledger. A new one is added about every 10 minutes, and each is numbered, starting from block 0, the genesis block mined on January 3, 2009. Because the chain only grows and never rewrites history, the block that was found on your date is a permanent marker for it.
Bitcoiners use block heights the way other people use dates: to tag a purchase, a wedding or the day a kid was born. Some even print their birthday block on a shirt or engrave it on a ring.
What the numbers on the card are
- Height is the block's number in the chain.
- Mined is the timestamp the miner put on the block, in your local time and in UTC.
- Reward is how many new bitcoin the miner could create in that block. It halves every 210,000 blocks, which is why a 2010 block paid 50 and a 2026 block pays 3.125.
- Hash is the block's unique fingerprint. The leading zeros are the proof of work.
Want the full story? Read our guides on the genesis block, what a block is and the next halving.
Questions
Good to know
What is a block's height?
Height is the block's position in the chain: the genesis block mined on January 3, 2009 is block 0, and every new block adds one. It is how bitcoiners refer to a moment in Bitcoin's history, the way a date works for a calendar.
Why does my date show a block from a few hours earlier or later?
Blocks arrive roughly every 10 minutes, not on a schedule, and timestamps are set by miners within a loose tolerance. The tool shows the last block mined at or before the moment you chose, in UTC.
Why can't I pick a date before 2009?
Bitcoin did not exist yet. The first block, the genesis block, was mined on January 3, 2009, so earlier dates have no block.
Where does the data come from?
Your browser asks mempool.space, a public block explorer, for the block at that time. Nothing you type is sent to us, and we do not store dates.
What is the block reward shown?
It is the number of new bitcoin the miner of that block was allowed to create. It started at 50 and halves every 210,000 blocks. It is 3.125 since the April 2024 halving.
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