SelfEmerging Data Infrastructures Timed release of data is an important security primitive for various applications. Such timed data release can be supported using a selfemerging data infrastructure that protects the data until a prescribed data release time and automatically releases to the recipient at the release time. While straightforward centralized approaches such as cloud storage services may provide a straightforward solution to implement selfemerging data release, unfortunately, they are limited to a single point of trust and involves a single point of control. In this vision paper, we discuss and review new decentralized designs of selfemerging data release systems using largescale peertopeer (P2P) networks as the underlying infrastructure. We analyze the design of decentralized selfemerging data release systems using two P2P network infrastructures, namely Distributed Hash Tables (DHTs) and blockchains. We demonstrate how selfemerging data release can be used to support gradual release of private data in a decentralized infrastructure. Finally, we present some promising directions of future research on security primitives and protocols for timed release of private data in decentralized environments.

BCSolid: A BlockchainBased Decentralized Data Storage and Authentication Scheme for Solid. Solid (Social Linked Data) aims to radically change the way web applications work today, giving users true data ownership and improved privacy. However, it is facing two challenges, one is that data in centralized repositories needs to be separated from social web applications that force users to share their information. In addition, a decentralized authentication that guarantees who can operate on userxe2x80x99s data with a secure privacy protection is another significant issue. In this paper, we address these challenges by proposing a blockchainbased decentralized data storage and authentication scheme for Solid, termed BCSolid, in which a userxe2x80x99s data can be independent of multiple web applications and can switch data storage service easily without relying on a trusted third party. Meanwhile, our scheme gurantees data ownership and userxe2x80x99s privacy by leveraging the blockchain miners to perform authentication with the help of certificateless cryptography. Additionally, we present a possible instantiation to illustrate how xe2x80x9ctransactionsxe2x80x9d in BCSolid are processed. To our knowledge this is the first work to promote the Solid project using blockchain. The evaluation results show that our scheme can gurantee a low latency network and is a promising solution to Solid.