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I was trying to send a single NFT with an expiry unlock condition using the wallet.rs library for Shimmer.

I have successfully created an account and funded it with the required SMR tokens and minted an NFT and I was able to send NFTs around. However, I'm having trouble figuring out how to send the NFT with the expiry unlock condition.

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This is the original code to send a single NFT using the send_nft() method

from iota_wallet import IotaWallet

# In this example we will send an nft

wallet = IotaWallet('./alice-database')

account = wallet.get_account('Alice')

# Sync account with the node
response = account.sync()
print(f'Synced: {response}')

wallet.set_stronghold_password("some_hopefully_secure_password")

outputs = [{
    "address": "rms1qpszqzadsym6wpppd6z037dvlejmjuke7s24hm95s9fg9vpua7vluaw60xu",
    "nftId": "0x17f97185f80fa56eab974de6b7bbb80fa812d4e8e37090d166a0a41da129cebc",
}]

transaction = account.send_nft(outputs)

print(f'Sent transaction: {transaction}')

Source: https://github.com/iotaledger/wallet.rs/blob/develop/wallet/bindings/python/examples/6-send-nft.py

Although, to add an expiration output unlock condition, it works differently.

To add an expiration condition, which for this example and in laymen terms means that the NFT will be sent back to my wallet, if the recipient does not claim it manually, one has to build the output manually.

Here are the examples that show how to prepare outputs using wallet.rs What you will need is the expiration time in UnixTime format like e.g. 1681286520

To calculate that you can use a site like https://unixtime.org/ or from the GNU/Linux command line with date -d"12 April 2023 10:02 AM" +%s

and here is the code to prepare the output and send one specific NFTs given it's nftId with an expiration time:

from iota_wallet import IotaWallet

# In this example we will mint an nft

wallet = IotaWallet('./alice-database')

account = wallet.get_account('Alice')

# Sync account with the node
response = account.sync()
print(f'Synced: {response}')

wallet.set_stronghold_password("some_hopefully_secure_password")

# The amount is 0, because we are not sending tokens but the amount field has to have a value
output = account.prepare_output(
    {
    "amount": "0",
    "recipientAddress": "rms1qzsvgp676a3xtru3sh9nmdd2qxzkmktxkgvhxcc2n20y50dq6nma72795cc",
    "unlocks":
        {
            "expirationUnixTime": 1681286520,
        },
    "assets":
        {
        "nftId": "0x244df0071cb93037fa376921b5de2083b8aed1814c26d778f1674cfa47ea448c",
        },
    }
)

transaction = account.send_outputs([output])

print(f'Sent transaction: {transaction}')

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