Block top - The block number and length from the blockchain (in blocks) on creation of the current block Nonce - The transaction number for the from address (bear in mind this starts at 0 so a nonce of 100 would truly be the a hundred and first transaction submitted https://bookmarkspecial.com/story20472311/the-fact-about-explorer-blockchain-base-that-no-one-is-suggesting-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers