Spending the genesis UTXO

Create keys and addresses to withdraw the initial UTXO:

cardano-cli keygen --secret utxo-keys/payment.000.key

cardano-cli signing-key-address --testnet-magic 42 \
--secret utxo-keys/payment.000.key > utxo-keys/payment.000.addr

Write genesis addresses to files:

cardano-cli signing-key-address \
    --testnet-magic 42 \
    --secret utxo-keys/byron.000.key > utxo-keys/byron.000.addr

It is time to spend the genesis UTXOs and send the funds to the regular Byron addresses created above. You will send funds from their genesis addresses byron.000.addr to your newly created regular payment.000.addr:

cat utxo-keys/byron.000.addr

>
2657WMsDfac6JrXMvC5KQuYhCFfhoS5c1jfBPje9vn2D86PkugFZa5oMWcBJo1nrt
VerKey address with root 79ed4e30d7707c20a8c958fe89146fd21e1536e3d29a29e0131deabf, attributes: AddrAttributes { derivation path: {} }

Create a directory for your transaction files:

mkdir transactions

And issue a genesis UTXO expenditure. Note that for simplicity the example is being generous with transaction fees. It will pay 1 ada or 1000000 lovelace:

cardano-cli issue-genesis-utxo-expenditure \
--genesis-json configuration/byron-genesis.json \
--testnet-magic 42 \
--tx transactions/tx0.tx \
--wallet-key utxo-keys/byron.000.key \
--rich-addr-from $(head -n 1 utxo-keys/byron.000.addr) \
--txout "(\"$(head -n 1 utxo-keys/payment.000.addr)\", 29999999999000000)"

Submit the transaction:

cardano-cli submit-tx \
            --testnet-magic 42 \
            --tx transactions/tx0.tx