Block top - The block selection and duration of the blockchain (in blocks) on creation of the current 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://isocialfans.com/story6026014/what-does-blockchain-explorer-usdt-mean-https-case-edu-cgi-bin-newsline-pl-url-https-cryptoexplorerhub-com