The Wacken NFT stamps use the Polygon protocol, which was created to counteract issues with scalability and high transaction fees of other blockchain protocols. Polygon is often referred to as a “Layer-2 solution“ because it operates on a separate blockchain network that is built on top of the Ethereum main chain. The Polygon network is designed to handle a large volume of transactions while maintaining low fees, while benefiting of Ethereum’s security and decentralization. This makes Polygon compatible with various NFT platforms such as OpenSea. Polygon utilizes the Proof-of-Stake consensus mechanism, which, in contrast to Proof-of-Work blockchains such as Bitcoin, is more environmentally friendly due to its lower energy consumption and reduced electronic waste production. Because of these sustainability and efficiency benefits, Wacken NFT stamps uses the Polygon network.