How to pass TxOutDatumNone when building a script transaction with cardano-cli

Question

I'm trying to consume a UTxO from a script address. When querying the script address with cardano-cli query utxo, I have the following UTxO:

                           TxHash                                 TxIx        Amount
--------------------------------------------------------------------------------------
10668bed901733bb0977ec72d1abad481865b34ea1c18302caaaa1eafe5784d2     1        1344798 lovelace + TxOutDatumNone

However, when constructing a transaction, I do not know how to represent TxOutDatumNone:

cardano-cli transaction build \
--alonzo-era \
...
--tx-in 10668bed901733bb0977ec72d1abad481865b34ea1c18302caaaa1eafe5784d2#1 \
--tx-in-datum-value WHAT_TO_PUT_HERE \
...

---

What I've tried:

• Not passing the --tx-in-datum-value altogether results in:

Missing: (--tx-in-datum-file FILE | --tx-in-datum-value JSON VALUE)

• Passing --tx-in-datum-value 0 results in:

Command failed: transaction build Error: The following scripts have execution failures: the script for transaction input 0 (in the order of the TxIds) failed with: The Plutus script witness for the txin does not have a script datum (according to the UTxO). The txin in question is 10668bed901733bb0977ec72d1abad481865b34ea1c18302caaaa1eafe5784d2#1

• Passing --tx-in-datum-value null results in:

option --tx-in-datum-value: JSON schema error within the script data: null JSON null values are not supported.

Answer 1

I'm afraid that presenting a "none" datum is not possible. This also means that this UtxO is lost (anybody, correct me if I'm wrong)

I don't know the very reason why it is possible to send a UtxO at a script address without datum hash, while at the same time it will not be possible to get it back. Anyway, pay attention to always send a datum hash when sending some value at a script address.

Answer 2

Usually when you want to pass empty datum to the script you'd pass an empty list like so

--tx-in-datum-value []

Answer 3

You can ignore it. You do not need to account for TxOutDatumNone in your tx-out or anywhere else. See for yourself by manually sending a TX using cli before you script it.