Block top - The block selection and length on 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 actually be the 101st transaction submitted by this account) https://bookmarking1.com/story20296879/the-smart-trick-of-blockchain-explorer-app-that-nobody-is-discussing-https-md-swk-web-com-onnbpblstmy8giqdrhnkga