# The Workings of Platypusâ NFT Minting

*Find out how Platypusâ minting process embodies our values where the number one priority isÂ you.*

Welcome to the world of Platypus Heroes, where minting is *transparent, fair, and safe* for all users. Platypus Heroes are NFTs that upgrade usersâ liquidity mining performance in Platypus Finance. How are they minted? How are their rarities distributed? Weâre gonna walk you through the details of **the novel NFT minting design** that gives birth to ourÂ Heroes.

### Random On-Chain Generation ofÂ NFTs

Random on-chain generation is not something you see every day. *In fact, itâs pretty rare*. Before we dive into the process and what it means to you, weâd like to lay the foundation that all Heroes are a combination of one skill and six randomly generated attributes: Accessories, Eyes, Mouth, Body, Skin, and Tail. **The generation is completely done on-chain to determine the appearance and score of a particular Hero**. The strength of skill theyâre born with is determined by the total score of each attribute. Weâll elaborate more on thatÂ later.

In a typical NFT minting method, the NFT contents and metadata are often generated and stored off-chain, while the links pointing to these data are stored on-chain. Accordingly, t**he underlying minting process can be non-transparent and prone to corruption, and the off-chain storage can be susceptible to data losses**.** In contrast, our fully on-chain minting design ensures that the process is transparent, fair, and safe for allÂ users.**

### Scores, Skills, and Powers: Calculation and Probability Distributions

Each Hero is made up of six attributes, as mentioned earlier. **Each attribute falls under either A, B, C, or D category in the grading system**; an A grade gives 4 scores while a D grade gives 1 score. The higher the score, the rarer it is and vice versa. Below is a table showing the probability of eachÂ grade.

Summing up all the six attributesâ scores ultimately equals a Heroâs score that, in turn, determines the HeroâsÂ class:

Score of a Hero = Sum of its Attribute Scores

**There are five classes in total: Common, Rare, Exceptional, Mystic, and Legendary**. As we move up the class ladder, the rarity increases, making them less likely to comeÂ up.

**Hereâs the best part: each Hero is born with one out of five skills that boost the liquidity mining performance**:

**Speedo**: Speeds up vePTP generation in percentage

**Pudgy**: Increases vePTP cap in percentage

**Diligent**: Increases vePTP generation by a fixed amount (subject toÂ cap)

**Gifted**: Increases your vePTP and vePTP cap by a fixedÂ amount

**Hibernate**: Retains a portion of vePTP upon unstaking (subject toÂ cap)

The first four skills each have an equal probability of 24% of obtaining during minting, while the âHibernateâ skill is particularly rare, with a possibility only at 4%. The Power of each skill depends positively on the Heroâs score, and every skill has a specific formula for calculating the skillÂ Power.

### Possible HeroÂ Twins

The total combinations of appearances and skills amount to (20â¶) 5 = 320,000,000, while the total supply of Heroes is 10,000. Although the supply is relatively trivial in size relative to the number of total combinations, the number of pairs implied by the supply is large (i.e., 10,000 (10,000â1)/2 = 49,995,000). **Then there is still some non-trivial probability that at least one pair of Heroes are identical in both appearances and skills**. Mathematically speaking, this is analogous to the classical birthday problem, which implies that, given any seemingly small sample size, the probability of coincidence tends to be greater than what your intuition guides.

### TLDR:

- All Platypus Heroes are randomly generated on-chain, ensuring a transparent, fair, and safe way of NFTÂ minting.
- Platypus Heroes carry scores that determine their classes and their skillsâÂ powers.
- As we move up the class ladder, the rarity increases, making them less likely to comeÂ up.
- Although the total combinations of Heroesâ appearances and skills are massive, there is some non-trivial probability that at least one pair of Heroes are identical within ourÂ supply.
- Check https://www.platypus.finance/nft/ for all the details about minting PlatypusÂ Heroes!

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The Workings of Platypusâ NFT Minting was originally published in Platypus.finance on Medium, where people are continuing the conversation by highlighting and responding to this story.