Transaction parameters

[Tr3yb0]

What do the parameters for transact really mean/do? (e.g., nonce, expire, fuel)

[Tr3yb0]

There are quite a few parameters building a transaction.

• auth: _auth/id used to submit the request — this is a pubkey hash derived from the private key, and is safe to share as a public identifier of your identity because it is impossible to reverse-engineer a private key from this hashed value
• db: the complete name of the ledger (e.g., test/one)
• expire: the time in seconds before a pending transaction should not be executed. Can be null. This helps to guarantee that your transaction message cannot be apprehended in-flight and submitted later
• fuel: the maximum amount of allowable fuel when executing a transaction. Can be null. This helps to ensure that, if the computational cost of your transaction is too high, then you can have Fluree cancel it entirely.
• nonce: any long/64-bit integer value that will make this transaction unique. Can be null. In addition to ‘expire’ this also helps to guarantee that a transaction message cannot be used as part of a double-transaction or man-in-the-middle attack
• tx: JSON stringified query
• deps: an array of _tx/ids that must have succeeded for the current transaction to be accepted. This can allow for subsequent, atomic transactions to be ensured to process in order, even if separate transactors are responsible for their processing