Block top - The block variety and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction number for your from address (bear in mind this commences at 0 so a nonce of a hundred would actually be the a hundred and first transaction https://social4geek.com/story6332665/the-best-side-of-explorer-blockchain-usdt-https-articlescad-com-the-remarkable-adventurers-in-the-cyber-frontier-grasping-distributed-ledger-instruments-325096-html