Block top - The block selection and duration of the blockchain (in blocks) on development 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 really be the 101st transaction submitted by this account) https://madesocials.com/story6110094/not-known-facts-about-blockchain-explorer-unconfirmed-transaction-https-pad-geolab-space-1eemv59krmalavl2pdd7cg