There are checksums, fairly good actually. If I remember right, about 4 bytes of checksum, so the change to mistype is fairly low. There have been some solutio

There are checksums, fairly good actually. If I remember right, about 4 bytes of checksum, so the change to mistype is fairly low. There have been some solution proposals to the problems you describe, firstbits comes to mind: https://en.bitcoin.it/wiki/Firstbits https://en.bitcoin.it/wiki/Firstbits