riddle - I make billions (#3)

I make billions (#3)

My products are quite edgy,
But most have been a bust,
I'm only one of many,
Lord knows who we can trust,

I'm not a politician,
Yet I work with presidents,

And like a mathematician,
I seek proofs of excellence,

I resemble a detective,
Who fills in all the blanks,
And if gold is your objective,
I've more than all the banks,

Who / what am I?

Hint for line 3:

Lines 3 and 4 are two sides of the same coin.

_{Previous riddles:
I make billions #1
I make billions #2}

Answer

It’s

The US Mint(s)

My products are quite edgy,

Coins have edges

But most have been a bust,

They have busts of politicians

I'm only one of many,

In the US the coins say “E Pluribus Unum”, meaning “Out of Many, One”. Thanks to @postmortes!

Lord knows who we can trust,

In the US the coins say “In God We Trust”

I'm not a politician,

Mints aren’t politicians

Yet I work with presidents,

Presidents have their likenesses on coins

And like a mathematician,
I seek proofs of excellence,

Per @JonMark Perry, a proof is a non-legal tender coin made pre-release in order to check the die for flaws

I resemble a detective,

Who fills in all the blanks,

A blank is a coin that hasn’t yet been stamped

And if gold is your objective,
I've more than all the banks,

The US Federal Reserve stores its gold bullion reserve in 4 Mint locations around the US including at Fort Knox, a US Mint with nearly 5000 tonnes of gold. Goldfinger famously went after Fort Knox rather than any bank when he was looking to steal gold from the US.