S. Hay, Bitcoin vs ethereum: Cryptocurrency comparison https://99bitcoins.com/bitcoin-vs-ethereum-cryptocurrency-comparison/. 16. Ori Jacobovitz. Blockchain for identity management, 2016.

Y. Liu, W. Tome, L. Zhang, D. R. Choffnes, D. Levin et al., An End-to-End Measurement of Certificate Revocation in the Web's PKI, Proceedings of the 2015 ACM Conference on Internet Measurement Conference, IMC '15, pp.183-196, 2015.
DOI : 10.1145/2663716.2663758

S. Nakamoto, Bitcoin: A peer-to-peer electronic cash system. Online, 2008.

A. Narayanan, J. Bonneau, E. Felten, A. Miller, and S. Goldfeder, Bitcoin and Cryptocurrency Technologies: A Comprehensive Introduction, 2016.

J. Nazaré, K. Hamilton, and P. Schmidt, Digital certificates project. online, source code available at https://github.com/digital-certificates, 2016.

R. Pass, L. Seeman, and A. Shelat, Analysis of the Blockchain Protocol in Asynchronous Networks, Advances in Cryptology -EUROCRYPT 2017 -36th Annual International Conference on the Theory and Applications of Cryptographic Techniques Proceedings, Part II, volume 10211 of Lecture Notes in Computer Science, pp.643-673, 2017.
DOI : 10.1145/383059.383071

G. Prisco, Estonian government partnerts with bitnation to offer blockchain notarization services to e-residents https://bitcoinmagazine.com/articles/estonian-government-partners-with-bitnation-to-offer-blockcha 24. Security Team. Specification of the identity mixer cryptographic library version 2.3.0, IBM Research, 2010.

K. Torpey, Are bitcoin miners making more money off small blocks? https://bitcoinmagazine.com/articles/are-bitcoin-miners-making-more-money-small-blocks/. 26. Gavin Wood. Ethereum: A secure decentralised generalised transaction ledger, p.150, 2017.

D. Yang, J. Gavigan, and Z. Wilcox-o-'hearn, Survey of confidentiality and privacy preserving technologies for blockchains, 2016.

G. Zyskind, O. Nathan, and A. Pentland, Decentralizing Privacy: Using Blockchain to Protect Personal Data, 2015 IEEE Security and Privacy Workshops, pp.180-184, 2015.
DOI : 10.1109/SPW.2015.27