 By the end of the crowdsourcing job , one of the miners, who is selected as the temporary leader, uploads the model to the blockchain.
<clarity>  By the end of the crowdsourcing job , one of the miners, who is selected as the temporary leader, uploads the model to the blockchain.
 By the end of the crowdsourcing task , one of the miners, who is selected as the temporary leader, uploads the model to the blockchain.