Block top - The block selection and length of your blockchain (in blocks) on generation of the present block Nonce - The transaction number for the from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://thebookmarkage.com/story20573169/blockchain-explorer-usdt-trc20-fundamentals-explained-https-md-swk-web-com-onnbpblstmy8giqdrhnkga