[4] His contributions as a civic hacker local to his community in Philadelphia has earned him recognition including from an open source project supporting the SEPTA train system.

At Villanova he was the top scorer in the William Lowell Putnam Mathematical Competition and worked in an apprenticeship where he programmed control modules for U.S. Navy Warships.

[12] His diverse career spans various roles across business, finance and technology including work as a solutions architect, a software developer at Google, a financial analyst for CDI Corp completing Mergers & Acquisitions, a consultant for Big Four's Ernest & Young, and a cybersecurity specialist collaborating with Apple and protecting retail investors' accounts with FINRA, SEC and the FBI.

[13] Civic hackers are persons who essentially utilize or improve on technologies for public good, whether at local, municipal, national or international scales.

[14] Entriken has been noted for his contributions as a civic hacker in the Greater Philadelphia area, focusing on projects that aim to enhance public access to data and improve government accountability.

While SEPTA's Chief Control Center Officer acknowledged the app as "a nice little tool", he also cautioned how tracking real-time train times was "a very delicate balancing act".

He was provided a quote of $11,200 by Xerox, the firm responsible for managing the court's data, as the cost to develop a program that could scan and identify all relevant cases within the database.

[17] In 2020, Inc Magazine reported that William Entriken broke a non-disclosure agreement to bring attention to a cybersecurity vulnerability he allegedly discovered in 2008 at stock-trading firm Zecco (now TradeKing).

[22] When the United Kingdom announced plans of introducing NFTs a year prior, in response Entriken publicly offered commentary around the tax considerations involved.

[23] In regards to environmental concerns, Entriken has advocated for the cryptocurrency industry to address its carbon footprint issues to avert going down a "destructive" path.

[29] It is regarded as a foundational and pioneering work that formally introduced the NFT concept, the word "Non-fungible Token" and catalyzed the multi-billion dollar digital collectibles eco-system.

It's important to note that, similarly to early drafts of literary works, these threads may contain ideas and discussions that did not make it into the final standard or published paper.

[32] (3) The codified standard itself: the actual set of rules and instructions, like a recipe, that explain how smart contracts should work to effectively create NFTs, which to written in the published paper.

NFTs are distinguishable and you must track the ownership of each one separately.Alongside the conceptual underpinnings, the technical specification of non-fungibility in the ERC-721 standard is recognized as being defined through a token ID and contract address.

[40] Conversations about non-fungibility and the token standard issue emerged internally within Dapper Labs that motivated Shirley's initial efforts to create the first draft of ERC-721.