Bitcoin: How was this transaction’s relative locktime satisfied?
Understanding the Bitcoin Locktime Transaction
As a Bitcoin user, understanding the nuances of transaction lock time is crucial to understanding how transactions are verified and processed in blockchain. In this article, we will deepen the specificities of how a particular transaction has been satisfied with your blocking report.
Transaction Break
Let’s look at the transaction provided: 3C1C9FB9D6B215EFDEEDB5CAF6A951A9E6C1E3DE6E5674F646C63E9467497. This transaction involves three entries, which we will refer to “1” and “2”. The first input output is labeled “3”, while the second input is called “32”.
OP_PUSHBYTES
The first lines of the transaction are OP_PUSHBYTES_3 FA0140, followed byOP_CSV. These commands indicate that we are about to push an bytes string (the value 0x4001fa) and calculate the sum of verification (op_csv) for it.
OP_DROP
Then the transaction executes an op_drop command, which indicates that the previously calculated verification sum is being discarded. This is done so that subsequent calculations can be performed without having to recompose the sum of verification.
Relative blocking time satisfaction
Now, let’s focus on satisfying the relative lock time for this transaction. Relative lock time refers to the time interval between two consecutive transactions that share a common input. In other words, if transaction A has an input with value x and transaction B shared the same input, the relative lock time of transaction B would be the difference between their input values.
For our given transaction:
- Input 1 (with value 0x4001fa) is shared by both transactions.
- Transaction output A is output 3, while transaction output B is labeled “32”.
To satisfy the relative lock time for this transaction, we need to ensure that the difference between input values does not exceed a certain limit. In the context of Bitcoin, the standard value for input validation is defined as nsequence = 0x4001fa, which means that the transaction will only be considered valid if the input value corresponds to the input used in the previous transaction (in this case, transaction A ).
However, as both inputs have the same value (0x4001fa) and we have already reduced the sum of verification, it is unlikely to be validated. In practice, Bitcoin uses a more robust validation mechanism involving multiple checks, including the Op_CheckMint command.
Conclusion
In short, to satisfy the relative lock time for this specific transaction, the input values must correspond exactly to consecutive transactions that share a common input. Since both inputs have the same value (0x4001fa), it is unlikely that the difference in input values will be significant enough to trigger validation checks. However, this provides information on how Bitcoin locking mechanisms works and highlights the importance of carefully examining transaction entries when checking your lock report.
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