That also means that Nonce=2573394689 for block 1 from blockchain.info is the correct value. share improve this answer follow edited Apr 16 '18 at 19:46 The Bitcoin Mining Algorithm From A Programmer's Viewpoint. block proof-of-work algorithms mining-theory block-header This page: Blocks said mining is actually to solve a mathematical problem, but reading Block hashing algorithm doesn't give much help.I also tried reading bitcoind source code, but reading code takes much more time than reading documentation:) And I have written a simple json ... I am using HMAC authentication to secure API. I have read that nonce and timestamps can be used to prevent replay attack. But my question is attacker can modified the nonce and timestamp to current Bitcoin puts the current compact-format target and the arbitrary-precision "extraNonce" number there, which increments every time the Nonce field in the block header overflows. Outputs can be anything, but Bitcoin creates one exactly like an IP address transaction. The extranonce contributes to enlarge the domain for the proof of work function. But I was wondering, whether there is an idea to generate and validate a nonce as above like to be used only once and if possible, can be used within a time limit (expiry) without storing the same in the database but simply returning it to the client in one wizard step and validate the same on the next step.
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