Satoshi's Secret hunt
Solved.

🕵️ Riddle #1: 'Transformation'
I start as one but can be two,
A protocol change; do you have a clue?
Once I split, there's no going back,

What am I, with my history unpacked?

Answer: Hard fork

🕵️ Riddle #6: 'EIP, you know me'
In Ethereum's tapestry, I'm a unique thread,
''EIP''' marks my start, where pioneers tread.
Four digits I boast, in a sequence designed,
Unlock their secrets, and clarity you'll find.
The first's a square, not very tall,

Riddle #6’: Skip to the third, where another square will call.
In between, find a cube that's also slight,
End with the first, and you'll have it right.
Identify the second author, for added insight.
Who am I, in the blockchain light?

Answer: Dankrad Feist