cardano-cli-plutus-scripts-operator

• When ready to spend from a script address
• After reviewing guidance from cardano-cli-plutus-scripts

• ALWAYS verify collateral UTxO is ADA-only
• Confirm script hash matches expected
• Validate datum/redeemer JSON before use
• REQUIRE explicit confirmation before submit
• Test on preprod/preview before mainnet

```

[ ] Network: ___________

[ ] Script file (.plutus) verified

[ ] Script hash matches on-chain

[ ] Datum JSON validated

[ ] Redeemer JSON validated

[ ] Collateral UTxO selected (ADA-only!)

[ ] Protocol parameters fresh

```

Step 1: Verify script

```bash

# Get script hash

cardano-cli conway transaction policyid \

--script-file script.plutus

# Derive script address

cardano-cli conway address build \

--payment-script-file script.plutus \

--testnet-magic 1 \

--out-file script.addr

```

Step 2: Query script UTxO

```bash

cardano-cli conway query utxo \

--address $(cat script.addr) \

--testnet-magic 1

```

Step 3: Prepare collateral

```bash

# Must be ADA-only UTxO at your payment address

cardano-cli conway query utxo \

--address \

--testnet-magic 1

# Select one with only ADA (no tokens)

```

Step 4: Build script spend

```bash

cardano-cli conway transaction build \

--testnet-magic 1 \

--tx-in # \

--tx-in-script-file script.plutus \

--tx-in-inline-datum-present \

--tx-in-redeemer-file redeemer.json \

--tx-in-collateral # \

--tx-out + \

--change-address \

--out-file tx.unsigned

```

Step 5: Sign and submit

```bash

# Sign (collateral signer required)

cardano-cli conway transaction sign \

--tx-file tx.unsigned \

--signing-key-file payment.skey \

--testnet-magic 1 \

--out-file tx.signed

# ⚠️ CONFIRM before submit

echo "=== SCRIPT SPEND CONFIRMATION ==="

echo "Script: $(cat script.addr | head -c 20)..."

echo "Spending UTxO: "

echo "Collateral: "

echo "Output to: "

cardano-cli conway transaction submit \

--testnet-magic 1 \

--tx-file tx.signed

```

```bash

# If script fails, check execution units

cardano-cli conway transaction build \

... \

--calculate-plutus-script-cost cost.json

# Review cost.json for budget issues

cat cost.json | jq .

```

• Collateral is at risk if script fails unexpectedly
• Use minimal collateral (1-5 ADA typically sufficient)
• Keep datum/redeemer free of secrets
• Verify script logic on testnet first

• cardano-cli-plutus-scripts (guidance skill)
• shared/PRINCIPLES.md