How to adding `--invalid-before` option when buiding tnx for a vesting script? about lucid HOT 4 CLOSED

Yes! Simply add validTo(unixTime) or validFrom(unixTime) to your tx if you want to make use of time.
For your tx it looks like you have to add validFrom because that should be equivalent to --invalid-before.
Note Lucid wants you to add the unixTime in milliseconds and not the slot. For instance you could make use of Date.now() in Js:

      const tx = await lucid
        .newTx()
        .collectFrom([utxo], Redeemer(number))
        .validFrom(...)
        .attachSpendingValidator(vestingScript)
        .addSigner(benificialAddress)
        .complete()

I saw that there is work around for this case which is adding --invalid-before 48866954 in cardano-cli transaction build

It's not a workaround. Adding an interval is necessary if you want your script to read out a certain valid time interval, for Plutus and Native scripts :)

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I watched this again (started at 29:24) slowly (0.5 xspeed), and everything clear now.
Thank you again!

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Thank you so much @alessandrokonrad.

It's not a workaround. Adding an interval is necessary if you want your script to read out a certain valid time interval, for Plutus and Native scripts :)

can you explain more on this, i really still feel dump why we need to add --invalid-before.

From what i understand, this part on on-chain

    deadlineReached = contains (from $ deadline p) $ txInfoValidRange info

assumed to check if the deadline reached or not.

Can you elaborate more on this ;)

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So, after thinking for a while,
i guess --invalid-before or validFrom option is checked when script is evaluated (when building tnx), before tnx actually hit (submit) on-chain logic.

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