salt used in PoW computation. Will be provided in PoW requirement
challenge phrase used in PoW computation. Will be provided in PoW requirement
target difficulty for which PoW should be generated. Will be provided in PoW requirement
notify progress with nonce after 'n' number of steps
callback function to notify progress
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Generate Proof-of-Work(PoW) according to the algorithm used in mCaptcha incrementally