Not sure what you mean by cold compost exactly, but mine takes a full year. The shrimp tails go in with other kitchen scraps (veggies, eggshells etc) and covered with a layer of clippings or weeds. I haven't had a problem with animals - there's nothing in the tail shells to appeal to a varmint. And they don't smell - I guess previously cooked means there's no rotting raw seafood juice aroma (yep I know about those! )
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