There are plenty of good suggestions already, but one thing I do very often to get text from my computer to my phone is just displaying the text as a QR code and scanning that. You can make it work the other way around if you have a webcam, but that’s a bit more work.

KeePass can do TOTP, it’s better to have a separate database for those for obvious reasons, though.

Seeing your nickname for the first time some years ago I thought it’d be funny if it’s a reference to Cassiopeia A, as it’s a remnant of a supernova that contains iron oxide.

All the pictures you linked are very much related to software development, your post targets economics exclusively, it has absolutely nothing to do with cryptocurrencies as a technology.

https://mpv.io/manual/master/#video-output-drivers-caca

caca

<. . .>

Note

This driver is a joke.

Obviously, we’all are solving audio problems.

If you want another “unga-bunga” approach, you can use netcat:
On the player machine:

nc -l 1234 | mpv -

On the sender machine:

ffmpeg | nc 192.168.1.4 1234

Of course, you can use any unused port instead of 1234.