Block top - The block selection and duration of the blockchain (in blocks) on generation of the present block Nonce - The transaction number for your 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://binksites.com/story10654022/5-tips-about-blockchain-explorer-you-can-use-today-http-bioimagingcore-be-q2a-user-storegarlic8