Abstract: A web-based commerce system may maintain a transaction state between the commerce system and a blockchain application for recording transactions involving NFTs on a blockchain. When a buyer intends to purchase an NFT, the commerce system must coordinate on-chain and off-chain processes with a merchant storefront and a blockchain application. Unlike conventional approaches, which perform these various processes in a serial, integrated manner, the commerce system and blockchain application separately execute these operations and perform the off-chain and on-chain processes independently.

Abstract: Methods and system for managing inventory in the context of online transactions involving blockchain-based payments. Examples may include determine an inventory count associated with an item with which a user device initiates a payment involving a blockchain transaction. The system determines a likelihood of completion with regard to the blockchain transaction based on one or more metrics related to recent transactions on the blockchain. Responsive to the likelihood of completion being above a minimum threshold value, the system records a hold in memory in association with the inventory count and then determines that the blockchain transaction has been completed and, in response, removes the hold from memory and decrements the inventory count.