# Cryptics book is available on Amazon

I am very excited to announce that my Cryptics book is now available in U.S and many other countries on Amazon.🕺💃🥳🎉🍾🎈

This is a perfect holiday gift for students, life-long learners, professionals, entrepreneurs and anyone interested in getting introduced to amazing math and crypto concepts in a fun way.

What is Cryptics ?

Cryptics is a hard science fiction novel and a technological thriller aimed at introducing some of the most amazing concepts of cryptography, blockchain, zero-knowledge proofs, artificial intelligence and mathematics in a fun, exciting and a memorable way.

It is a story of five middle school students, who meet at a talk given by Dr. Shiva Kintali, a billionaire mathematician and a technologist. Doc brings their attention to a puzzle, whose solution is worth \$10 Billion. The students compete with some of the best cryptographers, cypherpunks, mathematicians, coders and hackers of this generation. In the largest global treasure hunt ever. In the history of humankind.

I have started a newsletter on substack. Every week, I will be posting my collection of the most important latest news, educational articles and videos about Blockchain, Crypto, DeFi, AI, Privacy, Health, Tech in general and funny memes. Sometimes, I will add my own commentary, opinions and summaries.

It is free for everyone. My main goal is to educate everyone using bite-sized links, in less than 10 minutes.

Subscribe using this substack link: shivakintali.substack.com

Here is the First post and the Second post.

# Density of pythagorean triplets – Part 2

Several people really liked my previous puzzle, including some high-school students 🙂 Some of you have sent me photos of your hand-written proofs. This level of enthusiasm for mathematics is totally awesome. Here is a detailed proof with some beautiful diagrams by Chris Grossack.

Here is my next puzzle:

Let $x_1 < x_2$ and $a^2 + {x_1}^2 = {y_1}^2$ and $a^2 + {x_2}^2 = {y_2}^2$.

Let $x_3 < x_4$ and $b^2 + {x_3}^2 = {y_3}^2$ and $b^2 + {x_4}^2 = {y_4}^2$.

Also, $x_2 - x_1 = x_4 - x_3 = \delta$

All the above variables are positive integers and $a \neq b$ and $x_1 \neq x_3$ and $x_2 \neq x_4$

Prove or disprove the following claim:

Claim: There exists a rational number $0 < q < \delta$ such that $\sqrt{a^2 + {(x_1 + q)}^2}$ and $\sqrt{b^2 + {(x_3 + q)}^2}$ are rational numbers.

If you want to take small baby steps towards a proof, start with the following special cases:

Special case 1: $x_1 = x_3$ and $x_2 = x_4$

Special case 2: $x_1 = x_3$ and $x_2 = x_4$ and $a = b$

Quick homework problem: Prove the Special case 2 using a proof of my previous puzzle.

Have fun solving.

Some mathematician has said pleasure lies not in discovering truth, but in seeking it 🙂

# Density of pythagorean triplets

I designed this simple math puzzle last week:

Prove or disprove the following statement:

• Claim: Let $p, q, r, s$ be positive integers such that $p < q$ and $r < s$. Given two rational numbers $\frac{p}{q} < \frac{r}{s}$, there exist positive integers $a, b$ such that $a < b$ and $\frac{p}{q} < \frac{a}{b} < \frac{r}{s}$ and $a^2 + b^2$ is a perfect square.
• If the above statement is true, show an example of $a, b$, expressed in terms of $p, q, r, s$.
• If the above statement is false, construct a counterexample.

# EulerChain Cryptocurrency Mathematics Bounty 1

I am announcing cryptocurrency bounties for solving some of my favorite problems in mathematics. Here is the first one:

• Let P=(v1, v2, v3, v4) be a simple polygon drawn on a plane.
• The co-ordinates of the vertices v1, v2, v3, v4 are all rational numbers.
• The lengths of the edges (v1, v2), (v2, v3), (v3, v4) and (v4, v1) are all integers.
• The distance between v1 and v3 is an integer.

Conjecture 1: There exists a point x with rational coordinates inside P such that the euclidean distances between the pairs (x, v1), (x, v2), (x, v3), (x, v4) are all rational numbers.

Conjecture 2: Same as Conjecture 1 when the polygon P is convex.

Eulerchain bounties:

• 100 Eulercoins for proving Conjecture 1. This implies Conjecture 2 is also true.
• 50 Eulercoins for disproving only Conjecture 1.
• 50 Eulercoins for proving only Conjecture 2.
• 100 Eulercoins for disproving Conjecture 2. This implies Conjecture 1 is also false.
• The bounties are valid till Dec 31 2021. If they are not resolved by Dec 31 2021, I will revisit this and update the bounties.

Happy Solving.

# Prove or disprove this geometry conjecture

I am working on a geometry problem and it lead me to make the following conjecture:

Conjecture 1: Given any convex polygon (v1, v2, …. v_n) drawn on a plane with integer edge lengths, there is a point x inside the polygon such that the euclidean distances between the pairs (x, v1), (x, v2), … (x, v_n) are all rational numbers.

Theorem: Conjecture 1 is true for n = 3.

Simple Homework: Prove Conjecture 1 for an equilateral triangle.

Conjecture 1 seems like a very natural geometry problem. Is it well-known ? If you know any references, please leave a comment or email me.

# Anonymous Photo Journalism using freebits

I am very excited to announce ANONYMOUS accounts in the freebits iOS app using decentralized public key cryptography. Username, email and password are NOT required.

Citizen journalists, photo journalists and anyone anywhere in the world can use freebits to prove the authenticity of their photos, videos (captured using our iOS app) without ever revealing their real-world identity.

iOS app: https://apps.apple.com/us/app/freebits/id1582246045

Web app: http://freebits.app

A poll of 1,762 non-satellite TV stations and 3,379 radio outlets reveals journalists were threatened, assaulted, and even arrested at alarming rates across the U.S. in 2020. More details are in this article.

What is freebits ?

Freebits is a radically new kind of social media. It has built-in support for decentralized identities, privacy-preserving anonymous identities, AI-powered news aggregation, tamper-proof photos, videos, credentials and tamper-proof on-chain storage of socio-economic data (eg: unemployment numbers, prices of consumer goods, CPI to prevent data manipulation by governments and other centralized entities).Freebits is algorithm-free i.e., your posts will not be shadow-banned or hidden or suppressed.

Our mission is to enable journalists, creators, influencers, educators, podcasters, artists, politicians, activists, citizen journalists, photo journalists, data journalists, global leaders and everyone to speak freely to everyone globally, connect with their followers and get tips without any fear of censorship or shadow banning or de-platforming.

Freebits version 2.0 supports privacy-preserving anonymous accounts using public key cryptography. Username, email and password are not required. Citizen journalists, photo journalists and anyone anywhere in the world can use freebits to prove the authenticity of their photos, videos (captured using our iOS app) without ever revealing their real-world identity. Every photo and video shot using freebits app is a cryptographically-signed, verifiable and tamper-proof digital asset. The provenance and the digital rights of these assets are securely tracked using our Blockchain.

# Online version of Freebits White Paper

Online version of freebits white paper is now available as a medium post : https://kintali.medium.com/freebits-white-paper-814d97b81e18

The intention of releasing this paper is to persuade everyone with factual & technical evidence that there is a global problem that must be addressed immediately & our solution is a superior method of solving it.

A pdf file of the white paper was released last month. It is available at http://shivakintali.org/freebits.pdf

Also, ❤️🧡💛💚💙💜 Happy Pride month 🌈 to every global citizen… from the Freebits team.

Love, equality, human rights, free speech and freedom of expression for everyone. 🕺💃🎉🥳🍾

# Join Freebits and get free Euler cryptocurrency

Today we are moving freebits (a decentralized twitter) from “beta” stage to “stable release” stage. Anyone from anywhere can signup and start using all the features.

Join Freebits and get free Euler cryptocurrency, proportional to the number of your twitter followers.

Only for the first 10,000 signups.

No hidden games. No scams. No spammy emails. You create your decentralized ID and own your private keys. You own your Euler. We will never ask you to send your bitcoin or any other crypto. We will never ask you to share your private keys or seed phrases.