Question: when was the declaration of independence officially signed
[{'answer': 'August 2 , 1776', 'provenance': [{'wikipedia_id': '32226668', 'title': 'Signing of the United States Declaration of Independence', 'start_paragraph_id': 2, 'start_character': 197, 'end_paragraph_id': 2, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32226668', 'title': 'Signing of the United States Declaration of Independence', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 289, 'bleu_score': 0.96188712955549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12507709985575489359}, 'section': 'Section::::Abstract.'}]}]