ProofBook: An Online Social Network Based on Proof-of-Work and Friend-Propagation. Biedermann, S.; Karvelas, N. P.; Katzenbeisser, S.; Strufe, T.; and Peter, A. In SOFSEM 2014: Theory and Practice of Computer Science.
bibtex   
@inproceedings{ biedermann14proofbook,
  title = {{ProofBook: An Online Social Network Based on Proof-of-Work and Friend-Propagation}},
  author = {Sebastian Biedermann and Nikolaos P. Karvelas and Stefan Katzenbeisser and Thorsten Strufe and Andreas Peter},
  booktitle = {SOFSEM 2014: Theory and Practice of Computer Science}
}
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