> For the complete documentation index, see [llms.txt](https://lightpaper.crazydefenseheroes.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lightpaper.crazydefenseheroes.com/tower-nfts/tower-achievement-badge.md). # TOWER Achievement Badge
The TOWER Achievement Badge is a Souldbound Token (non-transferrable) NFT collection that signifies the contribution and achievements of the player's journey within the TOWER Ecosystem. The concept of **Soulbound token (SBT)** was first discussed by [Ethereum co-founder Vitalik Buterin](https://vitalik.ca/general/2022/01/26/soulbound.html) in January 2022. a soulbound token indicates non-transferrable ownership in the blockchain world that’s tied to a specific person, once it’s obtained, it cannot be transferred or sold to others. Learn more about Soulbound tokens from [CoinDesk](https://www.coindesk.com/learn/what-are-soulbound-tokens-the-non-transferrable-nft-explained/) and [Binance](https://academy.binance.com/en/articles/what-are-soulbound-tokens-sbt). TOWER Achievement Badge NFTs could be obtained from various Ecosystem Play-and-earn events, community engagement events, and external collaborations, Including: **CDH Play-and-earn events:** * Avatar XP Gain Elite Badge * Daily Star Chest Attendance Badge **Co-op Battle:** * Warrior Badge * Participation Badge **Meme Competition:** * Discord Meme God Badge **External Collaboration:** * BAYC Halloween Invasion Badge * TOWER x OnePlanet Event Badge All badges are viewable on [NFT marketplaces](https://linktr.ee/towertoken) and TOWER[ website](https://www.crazydefenseheroes.com/achievements).