Block top - The block number and size 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://socialstrategie.com/story6162121/what-does-eth-blockchain-explorer-mean-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers