quick and dirty Python graph scan for lightning nodes that support simple taproot channels

There was 93 nodes in my graph that support lightning, up from 3 the last time I checked!

```

import json

import subprocess

def get_pubkeys_from_lnd():

command = ["lncli", "describegraph"]

try:

output = subprocess.check_output(command, universal_newlines=True)

graph_data = json.loads(output)

# Extract the public keys from the nodes in the graph data

return [node['pub_key'] for node in graph_data.get('nodes', [])]

except subprocess.CalledProcessError as e:

print(f"Error running lncli describegraph: {e}")

return []

except json.JSONDecodeError as e:

print(f"Error decoding JSON output: {e}")

return []

def get_taproot_nodes():

taproot_nodes = []

pubkeys = get_pubkeys_from_lnd()

print(f"Got {len(pubkeys)} pubkeys. Scanning them for taproot support now.")

for pubkey in pubkeys:

try:

output = subprocess.check_output(

["lncli", "getnodeinfo", pubkey],

universal_newlines=True

)

node_info = json.loads(output)

# Check if feature "181" (taproot) is known

if node_info.get('node', {}).get('features', {}).get('181', {}).get('is_known'):

taproot_nodes.append(pubkey)

except subprocess.CalledProcessError as e:

print(f"Error processing pubkey {pubkey}: {e}")

except json.JSONDecodeError as e:

print(f"Error decoding JSON for pubkey {pubkey}: {e}")

# Write the final array of taproot-enabled pubkeys to a file

with open('results.txt', 'w') as result_file:

for node in taproot_nodes:

result_file.write(node + '\n')

print("Taproot nodes have been written to results.txt")

get_taproot_nodes()

```