Block top - The block selection and duration of your blockchain (in blocks) on generation of the present block Nonce - The transaction selection for the from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://baidubookmark.com/story20214524/top-guidelines-of-eth-blockchain-explorer-https-intensedebate-com-people-hawkwhorl3