I have a data object that looks like this:

    {
        'node-16': {
            'tags': ['cuda'],
            'localNodes': [
                {
                    'name': 'nC',
                    'consumesFrom': ['nA', 'nB'],
                    'classType': 'VectorAdder.VectorAdder'
                },
                {
                    'name': 'nB',
                    'consumesFrom': None,
                    'classType': 'RandomVector'
                }
            ]
        },
        'node-17': {
            'tags': ['boring'],
            'localNodes': [
                {
                    'name': 'nA',
                    'consumesFrom': None,
                    'classType': 'RandomVector'
                }
            ]
        }
    }

Notice that node nA is a producer for nC. What's the fastest way to find out if a given localNode is a producer for another localnode in the data structure (and not within the same list)?

For example, I would like to know that nA (node-17) produces for nC (exists on node-16). But I don't need to know that nB produces for nC, since they exist in the same localNodes list.