Block top - The block number and length from the blockchain (in blocks) on development of the current block Nonce - The transaction variety for that 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://bookmarkoffire.com/story20626281/blockchain-explorer-usdt-trc20-fundamentals-explained-https-www-blurb-com-user-optionname7