>>354689 Discussed this image here → >>329170
"Agreed. Call me. Let it Ring O.N.C.E.
i'll call back."
is plainly code.
Once means eleven in Spanish
Letting the phone ring once then hanging up is a signal.
A key ring was posted in ~#392 (pic)
Key ring is crypto terminology.
Crypto key storage is called a key ring.
Maybe this means that all the bit strings on the various posts comprise ONE key RING.
It's something about the crypto keys.
Scratches head.