Bitcoin Institute

Satoshi to Nicholas Bohm: the number of blocks in the network's block chain (February 13, 2009)

Satoshi Nakamoto February 13, 2009 15:09 UTC

It’s the total number of blocks in the block chain, meaning the network’s block chain, which everyone has a copy of. Every Bitcoin node displays the same number and it goes up about every 10 minutes whenever someone generates a block. When you haven’t had it running for a while, once you’re connected it spins up rapidly as it downloads what was generated while you were gone to catch up. I’m not sure exactly how to describe it (that would fit on the status bar in 1 word, maybe 2 words max), any ideas?

The blocks number in the status column next to your transactions is the number of blocks that have come after that transaction. Your transaction is essentially “in” that many blocks.

Satoshi

Quote from: Nicholas Bohm on February 12, 2009, 5:52:00 PM UTC

The bottom of the UI shows:

Generating      4 connections    4024 blocks    164 transactions

I understand “generating”; I assume I am connected to 4 other nodes; and I know I have recorded 164 transactions (including failed generation attempts). I’m not clear what the “blocks” figure describes. It’s much smaller than the total of all the blocks shown against all my transactions.

Regards,

Nicholas

Original external source

https://eth.loan/pdfs/20090213-Re_Bitcoin%20UI%20question-172968.pdf
From exhibit NB1 to Nicholas Bohm's witness statement in COPA v Wright: his own export of his correspondence with Satoshi from Mozilla Thunderbird, filed in July 2023 and put online by decashed.eth in January 2025. The time is the one shown in Bohm's mail client (UK time), converted to UTC. The postal address and telephone numbers in Bohm's signature are omitted.