Transaction Validation

Old method:

• Get an account of the sender
• Get the txn count of the sender
• Check transaction type is supported
• Check the extra field is all alphanumeric
• check the nonce == got txn count of the sender
• check the hash of the transaction is correct
• check the amount is over 1
• Check the size of extra for each type:
  • Normal: 100
  • Fullnode reg: 296
  • Username reg: 298
• Check the txn has a receiver
• Check gas for each type of transaction and that max gas > gas used:
  • Normal: 20 + (60 * length of extra)
  • Message: 20 + (100 * length of extra)
  • Claim: Don't check gas
  • Other: 20
• If unlock time != 0, check timestamp < unlock time
• If type= username reg check amount > username_burn_amount
• Check timestamp is not more than transaction_timestamp_max_offset in the future
• if the access key is empty:
  • if type != claim check account balance > amount + fee
  • Check the extra size is not over 100 (DUPLICATE: SHOULD NOT HAVE BEEN RECHECKED)
  • Check the sender account exists
  • Check the signature is valid
• Else:
  • Try to find the access key in the sender's account
  • if the type of transaction is not claim check that the access keys allowance is above the amount + fee
  • Try to decode the access key
  • Check the signature using a decoded access key

New:

• Check the public key of the sender, if the username get the public key
• get the account of the sender
• Check hash of the transaction
• Check for duplicate hash
• Check signature of the transaction
• Check to receive account exists
• Check the account transaction count == nonce
• Check extra is alphanumerical
• Check gas price >= min_gas_price (1)
• Match type:
  • Normal:
    • Check extra size is < 100
    • Check amount is over 1
    • Check the sender.balance > (amount + fee)
    • Get receiver account
    • Check the (max_balance - receiver.balance) > amount
    • Check gas >= 20 + (60 * length of extra)
    • Check gas <= max_gas
    • If unlock time != 0, check timestamp < unlock time
  • Claim:
    • Check - Check extra size is < 100
    • Check amount is over 1
    • Check the (max_balance - sender.balance) > amount
    • Check unlock time == 0
  • Fullnode registration:
    • Check extra len = 296
    • Check the registration is correct
    • Check gas > 316
    • Check gas <= max gas
    • Check unlock time = 0
  • Username registration:
    • Check extra len = 298
    • Check the registration is correct
    • Check gas > 318
    • Check gas <= max gas
    • Check unlock time = 0
  • Message:
    • Check extra size is < 1000
    • Check amount = 0
    • Check the sender.balance > fee
    • Check gas >= 20 + (250 * length of extra)
    • Check gas <= max_gas
    • Check unlock time = 0
  • Block Account:
    • Check extra size = public_key_len
    • Check amount = 0
    • Check the sender.balance > fee
    • Get receiver account
    • Check gas >= 20
    • Check gas <= max_gas
    • Check unlock time = 0
    • Check the account being blocked is not already blocked by sender
  • Unblock Account:
    • Check extra size = public_key_len
    • Check amount = 0
    • Check the sender.balance > fee
    • Get receiver account
    • Check gas >= 20
    • Check gas <= max_gas
    • Check unlock time = 0
    • Check the account being blocked is blocked by sender
  • Other:
    • unsupported transaction type
• Check timestamp is not more than transaction_timestamp_max_offset in the future
• if the access key is empty:
  • Check the signature is valid
• Else:
  • Try to find the access key in the sender's account
  • if the type of transaction is not claim check that the access keys allowance is above the amount + fee
  • Try to decode the access key
  • Check the signature using a decoded access key