Series I · Card 2 of 21 · SATOSHI’S MAILBOX
The only way to confirm the absence of a transaction is to be aware of all transactions.
SATOSHI NAKAMOTO · BITCOIN WHITEPAPER · 31.10.2008
Turn it over, answer, sign – free, no account.
Source
Bitcoin whitepaper, 31 October 2008, ch. 2 “Transactions”
About the author
Pseudonymous creator of Bitcoin. Published the whitepaper “Bitcoin: A Peer-to-Peer Electronic Cash System” in 2008 and launched the network in 2009. Their identity remains unknown.
About the source
The Bitcoin whitepaper: Satoshi’s nine-page design for electronic cash without a middleman, published on 31 October 2008.
The question on the back
Are you aware how many third parties see every payment you make?