Quick links (make your own NFT contract):

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William Entriken

William Entriken

Philadelphia USA / 中国上海

developer communities, zero-day research

Selling NFTs (2018–2021)


Su Squares

3,000+ minted

Art (all 1 of 1):


0.4 ETH

Genesis: Commemorating the First ERC-721 NFT

Sold 15 ETH

The Birth of an Idea w/ @conwellsclub

1,000 NEAR

All Kindsa Media w/ Julio Slim, Indigo Cowherd, Will Gaines


On the road to El Chalten w/ Elia Locardi

Sold 0.1 ETH

Golden Landscape w/ Heidi von Son de Fernex

0.1 ETH

Ella's Dreams w/ VjDeliria


Open source every day

I am the lead author of ERC-721, the document that started NFTs as we know them, and its vision.

Get answers to your pressing tech and business questions on a public ask-me-anything call or enroll in advisory services.

Community events/hackathons

I build communities for technology events and products. This includes hackathons like the TRON DAO Hackatron and very exciting and interactive workshows to explain what is NFT/blockchain (here is part of one such presentation).

Usually these events are public, see some past appearances.

Here is a paid promotional video I did for TRON vs. Ethereum.

White paper review and business planning

Including technical and business review. Weekly cadence with CEO and CTO working on execution. See achieved outcomes on my advisory page.


See how clients like Nebula Revelation, Arianee, EY, Light.art, Origins NFT, Lucid Sight (MLB Champions), Airbus A³, Dream Syndicate (Rawlings NFT), a checkout processor in the sports/events industry, TreasureDAO, Aleph Crypto Fund, defendant in an investor lawsuit, TRON DAO, a hedge fund, expert witness for litigation have overcome challenges with my expertise.

Code reviews

Some typical design and code review work I have done includes:

Privacy Log

I perform technical research of smart contracts and websites. This includes work with the FBI and Apple. Usually I publish these on Privacy Log, and sometimes these publications are live zero-days if the vendor failed to take corrective action. (Of course, I never post zero-days against advisory clients.)

Recent zero-days:

Monthly updates since 2008

Press coverage

Self portraits for media

On stage
William interviewing ministry officials, Estonia, 2022

On stage, travel

Learn at my workshops and speeches, invite me to your event.

This work was sponsored in part by Ethereum Foundation and Microsoft.

Full product cycles

Here are some products I brought from idea to market. Includes commercial successes, open sourced that you can copy.

19 Questions is a machine learning game that asks you questions about the world.

open source bayesian statistics

Nineteen Eighty-Five is a modern printing of the classic George Orwell book. Orwell’s protagonist battles with his own incriminating #searchhistory, the prying eye of the Social Justice Warriors watching him through his smart device

open source Amazon KDP

SEPTA OTP is my recommended changes to Philadelphia rail schedules which the transit authority has incorporated. It also documents late trains, which you can use to excuse work lateness.

open source patent

Who's the Impostor (谁是卧底) is a party word game for 3–12 players. Ranked in top 100 charts for MX, CN, RU.


Light.art NFT drop is a series of NFTs published by high-profile professional photographers. Sold out for 100 Ether in hours.

open source

Echo lets you hear yourself and native speakers to improve pronunciation. This helps with language practice, speech pathology and accent reduction.

open source iOS

23andMe privacy kit by GenoBank anonymizes your DNA collection using physical shuffling and end-to-end encryption.

open source packaging design Ethereum Rinkeby

Formant Analyzer helped my wife improve vowel pronunciation (born in China living in USA) and is useful for speech pathologists.

open source iOS

Su Squares is the first NFT using the ERC-721 standard. This ushered in an era of new applications and enormous media coverage.

open source Ethereum Mainnet

Scribe Academy is one of several online training program launched through Pacific Medical Training and accredited through American Medical Association.

Anasquare is a word puzzle published nationally in GAMES magazine.

open source

System Bus Radio implements an AM radio on computers and phones that do not have radio transmitting hardware. Unclassified implementation of TEMPEST data exfiltration.

open source


Extra stuff for stalkers


Active projects you can join


  • My wife and I run a boudoir photography studio. Check out https://glamourphilly.com/

Things I made that you can buy:

More music:

  • Only (and music video)-- my award winning remix of Nine Inch Nails's song. I was a winner in WYSP's First NIN Remix content (2005) and got to meet the band. My track was runner up and the other guy was published on NIN's next album.
  • Air the first track my wife and I made together. Based on Air by Dzeko & Torres.

Civic projects:

  • EMCCC, PA Eastern Montgomery County Chamber of Commerce, PA, co-chair government affairs committee board. We work with local, state and federal government representatives to connect local businesses with elected officials.
  • SEPTA rail scheduling I consult with SEPTA to help set their rail schedules. Also, I independently measure On-Time Performance of all SEPTA trains. If you are ever late for work because of a late train, use my website as proof so you have an excuse. Patent application.
  • Philadelphia Traffic Court Philadelphia Traffic Court made national headlines throughout 2014 as its offices were raided by the FBI and 9 current and former judges face indictments on 77 counts. I successfully petitioned the Philadelphia government to make public their entire database of traffic violations. Now lawyers use it to appeal old tickets and some people have used the data to find evidence of wrongdoing.

Contributions / big projects


My sizes

  • 39L/40L suit
  • 33 slack / 33 inseam
  • 15 1/2 - 34/35 shirt

Best marathon time: 9h : 13m

Birthday: 1985-07-01