What Is Satoshi Nakamoto's Birthday?
Software programmers often leave Easter eggs in their code for people to find.
The symbolic birthday of the pseudonymous Bitcoin creator, Satoshi Nakamoto, appears to be 5 April 1975 and a significant Easter egg.
How 5 April 1975?
Ning/P2P Foundation requires a birthdate for signups, and displays for every member an age calculated from that birthdate. This is the basis for ages given for Satoshi.
However, the age changes each year. For example, based on archives collected by Archive.org the profile for Satoshi Nakamoto:
Watching these increments, on 4 April 2014 the profile displayed 38 and 5 April 2014 it displayed 39.
Consequently, 5 April 1975 because 2014-39=1975.
Why 5 April 1975?
5 April does not seem to be a special date. it is not a round number, symbolic date, not your usual fake birthday like 1 January or April Fools Day, it is not the day Satoshi signed up for P2P ("Satoshi Nakamoto is now a member of P2P Foundation Feb 11, 2009"), not related to when Bitcoin was released (3 January 2009) or when the domain was registered (18 August 2008).
Thus, it seems like a good guess at a birthday.
But why would Satoshi choose this specific date? Perhaps he was leaving an Easter egg regarding his motivations with Bitcoin.
On 5 April 1933 U.S. President Franklin D. Roosevelt signed executive order 6102 "forbidding the Hoarding of Gold Coin, Gold Bullion, and Gold Certificates" by U.S. citizens.
This was a gross infringement on monetary sovereignty of the individual and a major violation of the United States Constitution which (1) does not empower under Article 1 Section 8 the Federal government to make anything legal tender and (2) requires under Article 1 Section 10 Clause 1 for legal tender to be only gold or silver.
In 1975 the limitation on gold ownership in the U.S. was repealed after President Gerald Ford signed a bill legalizing private ownership of gold coins, bars and certificates by an act of Congress codified in Pub.L. 93–373 which went into effect December 31, 1974.
Consequently, Satoshi appears to have left an Easter egg via his birthday regarding the infringement and restoration of monetary sovereignty.
More Easter Eggs
There are likely more Easter eggs which have been left by Satoshi Nakamoto.
For example, in 2014 Bitcoin thought leader Trace Mayer left a major clue about the reason Satoshi released Bitcoin on 3 Jan 2009.