The following uses the bcrypt encryption. The passphrase is "test".

PEM:
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL+iAxqlRjET5A4WiWr1A8Upnq12sJy2OEb0HMTeF0D2 This is a test key

HEX:
00000000: 0000 000b 7373 682d 6564 3235 3531 3900  ....ssh-ed25519.
00000010: 0000 20bf a203 1aa5 4631 13e4 0e16 896a  .. .....F1.....j
00000020: f503 c529 9ead 76b0 9cb6 3846 f41c c4de  ...)..v...8F....
00000030: 1740 f6                                  .@.

ANNOTATED HEX:
0 0000000b (11)
	0.0 7373682d65643235353139 ("ssh-ed25519")
1 00000020 (32)
	1.1 bfa2031aa5463113e40e16896af503c5299ead76b09cb63846f41cc4de1740f6 (bytes)