I think you miss the point.  If a PRNG is secure then you have no problems.  Are you SURE your PRNG implementation is secure?  Coins have be stolen in the past due to flawed PRNG implementations.  Now it is unknown if it was just a flaw or an intentional weakness (put there by 3 letter agencies which know they can break unbreakable ciphers when they rely on weak random numbers).  Still it doesn't matter the coins were stolen just the same.

This isn't a commercial project just something I want to do as a hobby and I will make the hardware and software open source.  Hopefully it leads to other open and transparent designs.