Block top - The block selection and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction variety for that from address (Remember this starts off at 0 so a nonce of a hundred would basically be the 101st transaction submitted by this account) https://nimmansocial.com/story10338875/not-known-details-about-blockchain-explorer-usdt-trc20-https-heavenarticle-com-author-pathpastor4-452336