Secure decentralized data storage. The permanent storage of 10 billion within blockchain, even assuming that each event would require only a very short record of 32 bytes of data, reach costs approaching 2.2 x 10-6 ETH (sstore operation gas cost) x 1010 x $200 (ETH price at the moment of publication) = >$4 million. It would be absurd to attempt to use blockchain for the storage of all big load of data. The use of secure decentralized storage such as Swarm16, IPFS17 with Filecoin18, or Storj19 with data history tamper proofing via Merkle tree hash codes stored inside blockchain is now a far more affordable, realistic alternative.. The Papyrus team is engaged in pilot experiments with different decentralized storage architectures to benchmark their properties and choose the most suitable one.
