p2sh – What’s improper with my script

There are just a few points with the supplied Bash script for creating and signing a Bitcoin transaction utilizing bitcoin-cli.

This is an in depth breakdown of the issues and instructed fixes:

Non-public Key Format:

Problem: The PRIVATE_KEY_1 and PRIVATE_KEY_2 are supplied as 64-character hexadecimal strings. Nevertheless, bitcoin-cli expects non-public keys in Pockets Import Format (WIF), which generally begins with a Okay, L, or 5 and is Base58 encoded.
Repair: Convert the hexadecimal non-public keys to WIF format. You should use instruments like bitcoin-tool or on-line converters, however make sure you’re working in a safe atmosphere to guard the keys.

Instance Conversion Utilizing bitcoin-cli:

# Convert HEX to WIF for PRIVATE_KEY_1
WIF_PRIVATE_KEY_1=$(bitcoin-cli -regtest dumpprivkey )

# Convert HEX to WIF for PRIVATE_KEY_2
WIF_PRIVATE_KEY_2=$(bitcoin-cli -regtest dumpprivkey )

Substitute and with the precise Bitcoin addresses linked to your non-public keys.

Invalid INPUT_TXID:

Problem: The INPUT_TXID is ready to all zeroes (0000…0000), which isn’t a sound transaction ID. This can trigger the createrawtransaction command to fail as a result of it references a non-existent transaction.

Repair: Use a sound transaction ID out of your blockchain (particularly because you’re working in regtest, make sure the transaction exists there).

Instance:

INPUT_TXID="your_valid_txid_here"

ScriptPubKey Format:

Problem: The REDEEM_SCRIPT_HEX supplied appears to be supposed for a multisig setup, however guarantee it matches the precise script of the UTXO you are attempting to spend.

Repair: Confirm that the REDEEM_SCRIPT_HEX corresponds accurately to the locking script of the UTXO. If it is an ordinary P2SH or P2WSH script, make sure the format aligns with anticipated patterns.

Deprecated signrawtransactionwithkey Command:

Problem: Relying in your bitcoin-cli model, the signrawtransactionwithkey command could be deprecated.

Repair: Use signrawtransactionwithkey if supported. In any other case, think about using signrawtransactionwithwallet or updating your script in line with the most recent bitcoin-cli documentation.

Output Handle Validation:

Problem: The OUTPUT_ADDRESS begins with 3, which is not an ordinary prefix on regtest. On regtest, addresses sometimes begin with totally different characters.

Regtest Prefixes:

Legacy addresses begin with: m or n
P2SH addresses begin with: 2
Bech32 addresses begin with: bcrt1

The tackle 325UUecEQuyrTd28Xs2hvAxdAjHM7XzqVF
does NOT conform to plain regtest tackle codecs.

Repair: Make sure the OUTPUT_ADDRESS is a sound tackle in your regtest atmosphere. You possibly can generate a brand new tackle utilizing:

# Generate a brand new legacy tackle in regtest
bitcoin-cli -regtest getnewaddress "" legacy

# Generate a brand new P2SH tackle in regtest
bitcoin-cli -regtest getnewaddress "" p2sh

# Generate a brand new bech32 tackle in regtest
bitcoin-cli -regtest getnewaddress "" bech32

Substitute the tackle 325UUecEQuyrTd28Xs2hvAxdAjHM7XzqVF with an tackle generated straight out of your regtest Bitcoin node utilizing the instructions above.

Dependencies and Instruments:

Problem: The script makes use of jq to parse JSON. Be sure that jq is put in in your system.

Repair: Set up jq if it isn’t already current.

# sudo apt-get set up jq

Sequence Quantity Utilization:

Problem: The SEQUENCE is ready to 0xffffffff, which is the default and won’t be crucial until you are implementing particular options like Substitute-By-Charge (RBF).

Repair: If not wanted, you possibly can omit the sequence subject within the enter object.

Total Script Enhancements:

Safety: Keep away from hardcoding non-public keys in scripts. Think about using atmosphere variables or safe key administration methods.

Error Dealing with: Add checks to make sure every command executes efficiently earlier than continuing to the following step. This may also help in debugging points extra successfully.

Instance:

# Create uncooked transaction
UNSIGNED_TX=$(bitcoin-cli -regtest -rpcuser=alice -rpcpassword=password createrawtransaction '[{"txid":"'$INPUT_TXID'","vout":'$INPUT_VOUT'}]' '{"'$OUTPUT_ADDRESS'":'$VALUE'}')
if [ $? -ne 0 ]; then
  echo "Didn't create uncooked transaction."
  exit 1
fi

# Signal transaction
SIGNED_TX=$(bitcoin-cli -regtest -rpcuser=alice -rpcpassword=password signrawtransactionwithkey "$UNSIGNED_TX" '["'$WIF_PRIVATE_KEY_1'", "'$WIF_PRIVATE_KEY_2'"]' '[{"txid":"'$INPUT_TXID'","vout":'$INPUT_VOUT',"scriptPubKey":"'$REDEEM_SCRIPT_HEX'","redeemScript":"'$REDEEM_SCRIPT_HEX'"}]')
if [ $? -ne 0 ]; then
  echo "Didn't signal transaction."
  exit 1
fi

By addressing these points, your script ought to operate accurately in creating and signing a Bitcoin transaction inside your regtest atmosphere.