Block top - The block selection and length from the blockchain (in blocks) on creation of the current block Nonce - The transaction range with the from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://one-bookmark.com/story20156926/a-review-of-blockchain-explorer-xrp-https-pad-geolab-space-1eemv59krmalavl2pdd7cg