http://7fa6xlti5joarlmkuhjaifa47ukgcwz6tfndgax45ocyn4rixm632jid.onion/anonbib/cache/chaum-mix.html
With a cascade of mixes, the message part is prepared the same as for
a single mix, and the address part is as showin in the following
input:
K1( R1, K2( R2, ..., K<n-1>( R<n-1>, Kn( Rn, Ax ))...)), Kx( R0, M ) -->.
The result of the first mix is
K2( R2, ..., K<n-1>( R<n-1>, Kn( Rn, Ax ))...), R1( Kx( R0, M )) -->,
and the final result of the remaining n-1 mixes is
Ax, Rn(...