Block height - The block selection and duration with the blockchain (in blocks) on generation of the present block Nonce - The transaction selection 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://socialevity.com/story22551224/not-known-details-about-blockchain-explorer-usdt-trc20-https-forum-issabel-org-u-optionray7