Block top - The block number and size on the 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://seolistlinks.com/story21982724/the-blockchain-explorer-usdt-trc20-diaries-https-notes-io-ww2s8