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Notes on hashing

Any of the supported hashing functions can be used when building a new blockchain, SHA256 is used by BitCoin, but also SHA1, or the broken MD5 are available.

Block Hash

Each block is double hashed from its header concatenated fields:

• Version (float)
• Id (int)
• Timestamp (ISODateString)
• TransactionsHash (String - concatenated Transaction hashes)
• PreviousHash (String - hex hash of previous block)
• CoinBase1 (String - hex hash)
• Nonce (hex string)

Transaction Hash

Each transaction is hashed from its concatenated fields:

• Id (int - increases within block)
• Sender (String - wallet address)
• Receiver (String - wallet address)
• Amount (float)
• Timestamp (ISODateString)

TODO: Merkle Root hash for transactions, or work is not the same for all blocks.