Block Validation

Full validation method:

• Check version tags are supported by our node software

• Check network tag is correct

• Check block hash

• Check if we have the block, in raw files or in checkpoints

• If height = 0:

  • Check if prev hash == "00000000000"
  • Check if we have a preset genesis block for that chain, if we do make sure they are the same
  • Check if the account already exists (ensure it does not)
  • Check if the block is a Send block
  • Make sure there are no transactions in the block
  • check block signature

• Else:

  • Check account does exist
  • Get block at height block.height - 1 for block.chain_key
  • Make sure got block (call it prev_block).hash = block.prev_hash
  • Check block's timestamp is not transaction_timestamp_max_offset in the future or past
  • Check block's timestamp is above the previous block/ prev_block
  • Check block.txn.len() <= 10
  • If Send block:
    • Check signature
    • For each transaction, validate it
    • check each transaction's sender key is the creator of this block
  • Else:
    • Check we have the Send block for this block
    • Check all block.txns.recieve_key == block.chain_key
    • Check send block is in fact a send block

Thin mode:

• Check block hash
• Check for conflicting block
• Check all signatures
• Perform minimal transaction validation