Added the code

.gitignore

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+.idea

build.sh

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+GOOS=js GOARCH=wasm go build -o hashcat.wasm

go.mod

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+module concord.hectabit.org/Hectabit/hashcat-wasm
+
+go 1.22.5
+
+require github.com/catalinc/hashcash v1.0.0

go.sum

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+github.com/catalinc/hashcash v1.0.0 h1:DiI2kBNCczy7y3xJnLddIl7KGx0yP4B7irFZZ+yzzwc=
+github.com/catalinc/hashcash v1.0.0/go.mod h1:ldWL6buwYCK4VqIkLbZuFbGUoJceSafm8duCEQYw9Jw=

main.go

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+package main
+
+import (
+	"fmt"
+	"github.com/catalinc/hashcash"
+	"syscall/js"
+)
+
+func main() {
+	fmt.Println("HashCash online! (no, curious console-dweller, this isn't a cryptocurrency miner)")
+	fmt.Println("Beginning proof of work (this may take a while)...")
+	pow := hashcash.New(20, 16, "I love burgernotes!")
+	stamp, err := pow.Mint("signup")
+	if err != nil {
+		js.Global().Set("returnVar", js.ValueOf(err.Error()))
+		js.Global().Set("returnCode", js.ValueOf(2))
+		fmt.Println("An error occurred whilst working:", err)
+		js.Global().Call("WASMComplete")
+	} else {
+		js.Global().Set("returnVar", js.ValueOf(stamp))
+		js.Global().Set("returnCode", js.ValueOf(0))
+		fmt.Println("Proof of work completed successfully:", stamp)
+		fmt.Println("Again, no, this isn't a Crypto miner. It's an anti-spam measure. I promise.")
+		js.Global().Call("WASMComplete")
+	}
+}