Block top - The block number and length on the blockchain (in blocks) on generation of the present block Nonce - The transaction selection with the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://bookmarkingace.com/story20511868/blockchain-explorer-usdt-trc20-fundamentals-explained-https-codimd-fiksel-info-7obh-70jsduk4-4exx8mba