populate_mempool.sh

Author: RandyMcMillan

populate_mempool.sh

@@ -1,12 +1,10 @@
 #!/bin/bash
 
-#OP_RETURN_DATA="Hello From @RandyMcMillan $(date +%s)" # Data to embed in OP_RETURN
-
 # Configuration
-NUM_TRANSACTIONS=25        # Number of transactions to create
-AMOUNT_PER_OUTPUT=0.00001  # BTC amount for each recipient output
-INITIAL_FEE_RATE=1         # Starting fee rate in sat/vB
-FEE_RATE_INCREMENT=1       # Increment for fee rate per transaction
+NUM_TRANSACTIONS=10       # Number of transactions to create
+AMOUNT_PER_OUTPUT=0.00001 # BTC amount for each recipient output
+INITIAL_FEE_RATE=1        # Starting fee rate in sat/vB
+FEE_RATE_INCREMENT=1      # Increment for fee rate per transaction
 
 echo "Starting mempool population script for testnet..."
 echo "Creating $NUM_TRANSACTIONS transactions, starting with fee rate $INITIAL_FEE_RATE sat/vB"
@@ -19,14 +17,14 @@ then
 fi
 
 # Get a new address to receive change (and for initial funding if needed)
-CHANGE_ADDRESS=$(bitcoin-cli --testnet4 getnewaddress "mempool_filler_change")
+CHANGE_ADDRESS=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" getnewaddress "mempool_filler_change")
 echo "Using change address: $CHANGE_ADDRESS"
 
 # Get an initial unspent transaction output (UTXO) from your wallet
 # This assumes your wallet already has some funds.
 # If this fails, you need to fund your wallet first.
 echo "Searching for an initial UTXO in your wallet..."
-INITIAL_UTXO=$(bitcoin-cli --testnet4 listunspent 1 999999 '[]' true '{"minimumAmount":0.0001}' | jq -r '.[0]')
+INITIAL_UTXO=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" listunspent 1 999999 '[]' true '{"minimumAmount":0.0001}' | jq -r '.[0]')
 
 if [ -z "$INITIAL_UTXO" ] || [ "$INITIAL_UTXO" == "null" ]; then
     echo "Error: No suitable UTXO found in your wallet. Please ensure your testnet wallet has funds."
@@ -45,26 +43,25 @@ CURRENT_FEE_RATE=$INITIAL_FEE_RATE
 for i in $(seq 1 $NUM_TRANSACTIONS); do
     echo "--- Transaction $i ---"
 
-    OP_RETURN_DATA="mempool_recipient_$i-$(date +%s)" # Data to embed in OP_RETURN
     # Generate a new recipient address for each transaction
-    RECIPIENT_ADDRESS=$(bitcoin-cli --testnet4 getnewaddress "mempool_recipient_$i-$(date +%s)")
+    RECIPIENT_ADDRESS=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" getnewaddress "mempool_recipient_$i")
 
     # Create a raw transaction: spend CURRENT_UTXO, send to RECIPIENT_ADDRESS
     # fundrawtransaction will add the change output and calculate the fee
     INPUTS="[{\"txid\":\"$CURRENT_TXID\",\"vout\":$CURRENT_VOUT}]"
-    OUTPUTS="{\"$RECIPIENT_ADDRESS\":$AMOUNT_PER_OUTPUT, \"data\":\"$(echo -n $OP_RETURN_DATA | xxd -p -c 200)\"}"
+    OUTPUTS="{\"$RECIPIENT_ADDRESS\":$AMOUNT_PER_OUTPUT}"
 
-    RAW_TX_HEX=$(bitcoin-cli --testnet4 createrawtransaction "$INPUTS" "$OUTPUTS")
+    RAW_TX_HEX=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" createrawtransaction "$INPUTS" "$OUTPUTS")
 
     # Fund the raw transaction, specifying the fee rate and change address
-    FUNDED_TX_JSON=$(bitcoin-cli --testnet4 fundrawtransaction "$RAW_TX_HEX" '{"fee_rate":'$CURRENT_FEE_RATE', "changeAddress":"'$CHANGE_ADDRESS'"}')
+    FUNDED_TX_JSON=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" fundrawtransaction "$RAW_TX_HEX" "{\"fee_rate\":$CURRENT_FEE_RATE, \"changeAddress\":\"$CHANGE_ADDRESS\"}")
     FUNDED_TX_HEX=$(echo "$FUNDED_TX_JSON" | jq -r '.hex')
     FEE=$(echo "$FUNDED_TX_JSON" | jq -r '.fee')
 
     echo "  Fee rate: $CURRENT_FEE_RATE sat/vB, Estimated Fee: $FEE BTC"
 
     # Sign the funded transaction
-    SIGNED_TX_JSON=$(bitcoin-cli --testnet4 signrawtransactionwithwallet "$FUNDED_TX_HEX")
+    SIGNED_TX_JSON=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" signrawtransactionwithwallet "$FUNDED_TX_HEX")
     SIGNED_TX_HEX=$(echo "$SIGNED_TX_JSON" | jq -r '.hex')
     COMPLETE=$(echo "$SIGNED_TX_JSON" | jq -r '.complete')
 
@@ -75,11 +72,11 @@ for i in $(seq 1 $NUM_TRANSACTIONS); do
     fi
 
     # Broadcast the transaction
-    BROADCAST_TXID=$(bitcoin-cli --testnet4 sendrawtransaction "$SIGNED_TX_HEX")
+    BROADCAST_TXID=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" sendrawtransaction "$SIGNED_TX_HEX")
     echo "  Broadcasted TXID: $BROADCAST_TXID"
 
     # Find the change output from the broadcasted transaction to use as the next UTXO
-    DECODED_TX=$(bitcoin-cli --testnet4 decoderawtransaction "$SIGNED_TX_HEX")
+    DECODED_TX=$(bitcoin-cli --testnet4 --rpcwallet="testnet4" decoderawtransaction "$SIGNED_TX_HEX")
     CHANGE_VOUT_INDEX=-1
     for j in $(seq 0 $(($(echo "$DECODED_TX" | jq '.vout | length') - 1))); do
         SCRIPT_PUB_KEY_ADDRESS=$(echo "$DECODED_TX" | jq -r ".vout[$j].scriptPubKey.address")
@@ -107,5 +104,4 @@ for i in $(seq 1 $NUM_TRANSACTIONS); do
 done
 
 echo "Mempool population script finished."
-echo "You can check the mempool with: bitcoin-cli --testnet4 getrawmempool"
-bitcoin-cli --testnet4 getrawmempool
+echo "You can check the mempool with: bitcoin-cli getrawmempool"