Create a futuristic and sophisticated digital illustration for a website header, focusing on DEFI Crypto Loan services. The image should represent a high-tech, secure, and innovative financial environment. Include elements like digital currency symbols, blockchain networks, and futuristic cityscapes. The style should be sleek, with a color palette of blues, greens, and metallics to convey a sense of trust and advancement in the financial technology sector. The composition should be wide and balanced, suitable for a website banner --s 250