According to Cointelegraph, Indian state-owned oil refiner Hindustan Petroleum (HPCL) has partnered with blockchain software company Zupple Labs to integrate the latter's LegitDoc verification technology into the purchase order system. HPCL is one of India's largest oil and gas companies, and the partnership will enable automated verification of purchase orders (POs). A spokesperson for HPCL said the company has successfully built a blockchain PO system and will officially launch it to suppliers this month. HPCL's blockchain PO system has been implemented on both private and public blockchains. According to Neil Martis, co-founder and business head of Zupple Labs, the PO verification system uses two parallel blockchains as settlement layers, including the public Near blockchain and the private Hyperledger Fabric blockchain. As of mid-October 2023, HPCL has issued 3,000 POs through the system.

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