I really wonder what the memory overhead of the prolly tree is. Using hashes as links isn't cheap especially with sha-512 wide hashes (I think they use 20bytes

I really wonder what the memory overhead of the prolly tree is. Using hashes as links isn't cheap especially with sha-512 wide hashes (I think they use 20bytes in reality?). I'd estimate their fanout at between 50-200, which isn't that much either. So my feeling is expensive nodes, combined with low-ish fanout => high cost of storage?