Founded in 2017, SpaceChain is a community-based space platform that combines space and blockchain technologies to build an open-source blockchain-based satellite network, allowing users to develop and run decentralized applications in space. SpaceChain has adopted a dual token model – ERC-20 and QRC-20 — to expand their footprint and engage with additional communities of developers. The QRC-20 SPC token and ERC-20 SPC token will have a 1:1 swap exchange rate. The token supply that will be circulating will remain at 1,000,000,000 SPC. The QRC-20 SPC tokens and ERC-20 SPC tokens will remain interchangeable through authorized wallet services. This page refers to the ERC-20 version. After the swap, some exchanges such as CoinEgg, Coinnest and EXX started trade ERC-20 SPC tokens while others continued trading QRC-20 SPC tokens. ERC-20 SPC token is fully compatible with Ethereum Decentralised Finance (DeFi) products capable of automating enforceable agreements in a highly immutable, permissionless system facilitated by smart contracts. Existing ERC-20 SPC token (v1) holders can opt to upgrade their tokens on a one-to-one basis at any time with any volume, in a seamless and secure process managed by smart contracts on the Ethereum blockchain. The upgrade takes the SPC tokens (v1) and mints the exact same number of SPC tokens (v2). During the upgrade process, the tokens (v1) are either burnt or sent to the null address 0x0 to ensure permanent removal of the annulled tokens. Holders of QRC-20 SPC tokens can upgrade to the DeFi-compatible SPC token (v2) by filling in this form. SpaceChain (QRC-20) can be found here.