The note is not visible to the blocked user.
Added in 91cdb13bb3a30fd037489347a952f53d0ce3b5cf.
Implemented echo replies in 6de8d2453781d515d0c064b0e452c8081dec43f2.
Implemented in 172a11070b6688d878d4a356209f4e1954cdc637.
Encoding in fdcb1cb719e9435c98cd875953afcb2b5fffc29f.