Question: Which advocate for Bitcoin is also an executive with Lemon Wallet?

full_context: Document 1: Carlos Slim: Carlos Slim Helú (] ; born January 28, 1940) is a Mexican business magnate, investor, and philanthropist. From 2010 to 2013, Slim was ranked as the richest person in the world. He derived his fortune from his extensive holdings in a considerable number of Mexican companies through his conglomerate, Grupo Carso.
Document 2: Draper Associates: Draper Associates is an early stage venture capital firm that encourages entrepreneurs to drive their businesses to greatness, to transform industries with new technologies, and to build platforms for extraordinary growth, jobs, and wealth creation. The firm was founded by Tim Draper, and is best known for investments in companies such as Tesla, Skype, Baidu, Twitch, Theranos, and Thumbtack
Document 3: Apple Wallet: Apple Wallet (Wallet for short, formerly Passbook) is a mobile app included with the iOS operating system that allows users to store coupons, boarding passes, event tickets, store cards and (starting with iOS 8.1) credit cards, loyalty cards, and debit cards via Apple Pay. It was designed by Apple Inc. and was presented at the 2012 Apple Worldwide Developers Conference (WWDC) on June 11, 2012. The app first appeared on iOS 6 on September 19, 2012.
Document 4: Paymentwall: Paymentwall Inc. is a San Francisco-based international payments platform that allows both private individuals and businesses to sell goods and services over the Internet.
Document 5: Revolution Money: Revolution Money is a financial services company based in St. Petersburg, Florida. The company's products include a PIN-based credit card, online person-to-person payments service with a linked stored value card, and gift card. Revolution Money is the only credit card that does not charge retailers interchange fees. The company partnered with Yahoo! Sports and Fifth Third Bank.
Document 6: Union Square Ventures: Union Square Ventures (USV), is an American New York-based venture capital firm, that manages assets totaling $1 billion as of March 2016. The firm is one of the top returning venture capital funds in the world, its 2004 fund returning 13.91 times cash-on-cash with an IRR of 67.0%. The firm has had a billion dollar exit every year since 2011 including Zynga ’11 at 7.7B, Indeed ’12 at 1.4B, Tumblr ’13 1.1B, Twitter ’13 at 14.2 B, Lending Club ’14 at 5.42B, Etsy ’15 at 1.78B and Twilio ’16 at 1.23B. Additionally, the firm's founder Fred Wilson, who is well recognized as one of the best venture capitalists in the world, has acquired a celebrity status in the tech world stemming in part to his blog AVC.com
Document 7: David Jevans: David Jevans is the Chairman and founder of IronKey, an Internet security and privacy company in California. He has previously held senior positions at various Internet security companies, primarily Chief Marketing Officer and Senior Vice President positions at Tumbleweed Communications (NASDAQ:TMWD), Valicert (NASDAQ:VLCT), Teros (since acquired by Citrix, NASDAQ: CTXS), and Differential. Prior to moving into the security industry, he served on the CEO's technology council at Apple Computers, and as Vice President of Networking at Catapult Entertainment.
Document 8: Wences Casares: Wences Casares (born February 26, 1974) is a technology entrepreneur with global business experience specializing in technology and financial ventures. He is an advocate of bitcoin and he has said he believes that bitcoin will be bigger than the Internet.
Document 9: Yuval Ben-Itzhak: Yuval Ben-Itzhak is an executive and entrepreneur. He received a number of honors and public recognition for his work as a Chief Technology Officer throughout his career. Ben-Itzhak has been selected as the 25 most influencing CTO by Infoworld, 40 Innovative IT People To Watch by Computerworld, and 2017 Chief Technology Officer of the Year by GeekTime. He was the Chief Technology Officer at AVG and was part of the leadership team that took AVG through its initial public offering on the New York Stock Exchange in 2012. He was the Chief Technology Officer at Outbrain until 2017, and now is the Chief Executive Officer at Socialbakers.
Document 10: Cardmobili: CardMobili is a European-based mobile application development company founded in 2009. The primary application of the company, also named CardMobili, provides a platform for managing customer loyalty programs via mobile phones. The application provides for digitizing and storing loyalty and membership cards, allowing their barcodes to be scanned directly from the device screen. It supports Android, iPhone, BlackBerry, Windows Phone 7, Windows Mobile, Nokia, Vodafone, and other brands.
Document 11: Lemon Wallet: Lemon Wallet was a cloud-based digital wallet that allowed users to store digital copies of credit cards, debit cards, reward cards, as well as identification, and other card information. The service was released in July 2011 and the company is based in Palo Alto, California, United States. Wences Casares is the company’s CEO.
Document 12: Microsoft Wallet: Microsoft Wallet is a mobile payment and digital wallet service by Microsoft that lets users make payments and store loyalty cards on certain devices. Making payments is currently supported with the Microsoft Lumia 950, Lumia 950 XL, and Lumia 650. Microsoft Wallet does not require Microsoft Wallet-specific contactless payment terminals, and can work with existing contactless terminals. Similar to Android Pay, Microsoft Wallet utilizes Host card emulation (HCE) for making in-store payments.
Document 13: Digital wallet: A digital wallet refers to an electronic device that allows an individual to make electronic transactions. This can include purchasing items on-line with a computer or using a smartphone to purchase something at a store. An individual's bank account can also be linked to the digital wallet. They might also have their driver’s license, health card, loyalty card(s) and other ID documents stored on the phone. The credentials can be passed to a merchant’s terminal wirelessly via near field communication (NFC). Increasingly, digital wallets are being made not just for basic financial transactions but to also authenticate the holder's credentials. For example, a digital wallet could verify the age of the buyer to the store while purchasing alcohol. The system has already gained popularity in Japan, where digital wallets are known as "wallet mobiles". A cryptocurrency wallet is a digital wallet where private keys are stored for cryptocurrencies like bitcoin.
Document 14: Steve Jurvetson: Stephen T. "Steve" Jurvetson (born March 1, 1967) is an American businessman and venture capitalist. He is currently a partner of Draper Fisher Jurvetson (DFJ). He was a venture capitalist investor in Hotmail. He also led the firm's investments in Tradex and Cyras (acquired by Ariba and Ciena, respectively). Current board seats include SpaceX, Synthetic Genomics, Planet Labs, Nervana Systems (acquired by Intel), Flux, D-Wave, and Tesla. Jurvetson was the world's first Tesla Model S owner, the second Tesla Model X owner (VIN 2, following Elon Musk), and the fifth Tesla Model 3 owner (VIN 5).
Document 15: Peter Thiel: Peter Andreas Thiel ( ; born October 11, 1967) is an American entrepreneur, venture capitalist, philanthropist, political activist, and author. He was ranked No. 4 on the "Forbes" Midas List of 2014, with a net worth of $2.2 billion, and No. 246 on the "Forbes" 400 in 2016, with a net worth of $2.7 billion.
ground_truth: Wences Casares