Question
Would the hidden layer survive the delivered message?
A successful local encode and decode proves only the codec. The useful test is whether the delivered copy can still be decoded after passing through the encoder, clipboard, messaging client, transport, recipient, and another clipboard operation.
Observed result
The selected delivered Discord copy decoded successfully. This is one transport observation under the tested conditions.
What it does not prove
It is not a compatibility guarantee. A client, platform, sanitizer, or logging system can normalize or remove the invisible characters at any time.
Security boundary
This is steganography, not encryption. The payload can be recovered, inspected, modified, or removed.
Reproduction command
The real command used by the public tool.
zero-width-message encode "Nothing unusual here 👀" \
--payload "You found the hidden message." \
--copy- Dependency-free Python 3.10+
- Apache-2.0 licensed
- Delivered-copy verification required
- Fail-closed checksum behavior