Hi, After 24 hours my transaction ID still does not exist - I'm worried I will lose my bitcoin. Does it come back at some point? Please help!
f3431e9b795b1645d1feed966ed06fb947644dca117acfe9f2354e4811a6d6fb
Depends, were you using a service to create the transaction? If not, you should be fine, and you probably did something wrong while broadcasting your transaction to the network.
But then again, that depends on the wallet you're using, i can't really help you without it.
try to look up the values of the tx in your console when using bitcoin core, using
f3431e9b795b1645d1feed966ed06fb947644dca117acfe9f2354e4811a6d6fb
( To see if it's signed and in your own mempool, if so, try to rebroadcast it either through your own wallet or a web api such as
https://coinb.in/#broadcast)
If you are using a service, then there might be something wrong, and it would be smart to contact their support.