Great Tang Bid Technology, Inc. (OTCPink: ESPI, also GTBT) operates as a shell company with no significant current operations and seeks to merge with or acquire an operating business; formerly known as ESP Resources, Inc., it previously provided specialty chemicals, analytical services, manufacturing, blending, distribution, and marketing to the oil and gas industry, including products for North and South American exploration and production. Incorporated in 2004 and headquartered in Reno, Nevada, the company emerged from bankruptcy in April 2021 in the United States Court Southern District of Texas and completed a rebranding with FINRA to its current name in September 2021. In January 2022, it signed a letter of intent to acquire 100% of Great Tang Digital Limited, a Hong Kong-based entity developing NFT and blockchain platforms for digital art auctions, exhibitions, traditional art digitization, secondary trading, derivative sales, artist incubation under the Digital Ullens initiative, and art investment funds using public blockchains like Ethereum or Polygon; no subsequent updates confirm completion of this acquisition or further developments through 2025.