I mean merkle trees more or less yeah. I don't remember all of the sources I researched but here is a source for the use of two different hash functions (it was

I mean merkle trees more or less yeah. I don't remember all of the sources I researched but here is a source for the use of two different hash functions (it was for leaves not edges, my bad): http://crypto.stackexchange.com/questions/2106/what-is-the-purpose-of-using-different-hash-functions-for-the-leaves-and-interna http://crypto.stackexchange.com/questions/2106/what-is-the-p...