Which innovative audience engagement strategy did 'Hamilton' first utilize to dramatically boost its brand awareness and ticket sales?

In 2015, one Broadway show completely revolutionized how performing arts productions approach customer feedback and engagement. By implementing a unique strategy that connected directly with their target audience, they not only increased ticket sales but created an entirely new model for theatrical marketing that has since been widely adopted across the industry. Can you identify which groundbreaking approach they pioneered?

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Daily lottery for $10 front-row seats promoted through a dedicated mobile app
Releasing the entire soundtrack on streaming platforms before the show's wide release
Creating character-specific social media accounts managed by cast members
Implementing a subscription model that guaranteed tickets to future productions