Abstract: A computer-implemented method reliably stores data in a blockchain-based distributed storage system. The method utilizes computer processes carried out by a host computing device, including receiving from a renter computing device a storage contract proposal, sending over the network, by the host computing device to the renter computing device and to the blockchain, an acceptance of the storage contract proposal, and receiving from the blockchain, confirmation that a storage contract between the host computing device and the renter computing device has been added to the blockchain. After the data have been stored, the processes include computing a checksum, sending it to the renter computing device and to the blockchain and receiving, from the blockchain, confirmation that the checksum has been added to the blockchain.