Block top - The block selection and duration of the blockchain (in blocks) on generation of the present block Nonce - The transaction number for your from address (bear in mind this begins at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://worldsocialindex.com/story5368410/what-does-blockchain-explorer-usdt-mean-https-www-divephotoguide-com-user-puffinstone3