Block top - The block selection and size on the blockchain (in blocks) on development of the present block Nonce - The transaction number to the from address (Keep in mind this begins at 0 so a nonce of 100 would essentially be the 101st transaction submitted by this account) https://socialbookmarkgs.com/story20382968/what-does-blockchain-explorer-usdt-mean-https-articlescad-com-the-remarkable-adventurers-in-the-cyber-frontier-grasping-distributed-ledger-instruments-325096-html