Block top - The block selection and duration of your blockchain (in blocks) on creation of the current block Nonce - The transaction quantity for your from address (bear in mind this begins at 0 so a nonce of 100 would truly be the 101st transaction submitted by this account) https://digibookmarks.com/story20621109/not-known-details-about-blockchain-explorer-usdt-trc20-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers