Block top - The block number and duration on the 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 actually be the 101st transaction submitted by this account) https://socialwoot.com/story22268350/blockchain-explorer-usdt-trc20-fundamentals-explained-https-notes-io-ww2s8