Swiftly is a logistics service provider that connects customers directly to product manufacturers and sellers. When consumers look for a certain product or product category on Swiftly, the site lists all available manufacturers and sellers along with different available prices in that category. The site also shows ratings and feedback from the seller based on past customer reviews. A customer picks a seller of their choice and places an order, and Swiftly ensures timely delivery of the product.

a. Draw an E-R diagram in the third normal form showing the relationship between orders placed, manufacturers, sellers, and consumers at Swiftly.

b. In a paragraph, discuss how a blockchain application might be implemented here and what it would require.