1231006505

That’s the unix timestamp Satoshi manually hardcoded into the Genesis block. (18:15:05 UTC time). But why do a time that ends in 5 seconds rather than a nice round number?)

In Neuromancer, the protagonist dies for 5 seconds after being told that he must get someone to speak the secret password that only the character 3Jane knows. In fact, having died for 5 seconds after this mission is given to him is the opening of Chapter 15 of the book.

3Jane = 3Jan (Genesis block date and msg)

15:05 = Chapter 15, dead for 5 seconds

The Genesis block is a Neuromancer reference.