From my understanding a 'die crack' is supposed to protrude. The crack on the die used to strike the coin allows metal to then fill it in and you have a protruding crack on the surface of the coin.
The stuff in your picture just looks like little hairs...
On the reverse, that's just gunk residue, which isn't a error. Just Post Strike Damage ( PSD). Any event that happens after the coin is struck is just Post Strike Damage. You need to study up on the links we provided for you.
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