Add various papers

[dimkarakostas]

Checklist for submitting a pull request to blockchain-papers:

• [x] I have carefully read and comply with the Contributing Guidelines of this repo.
• [x] I have searched the PRs of this repo and believe that this is not a duplicate.

[dimkarakostas]

@dionyziz any review comments?

[dionyziz]

Ok

On Tue, Jun 11, 2019, 21:44 Dimitris Karakostas notifications@github.com wrote:

@dimkarakostas commented on this pull request.

In README.md https://github.com/decrypto-org/blockchain-papers/pull/90#discussion_r292607333 :

@@ -246,6 +248,7 @@ Sompolinsky Y, Lewenberg Y, Zohar A. '16.

• BigchainDB: A Scalable Blockchain Database. McConaghy T, Marques R, Müller A, De Jonghe D, McConaghy T, McMullen G, Henderson R, Bellemare S, Granzotto A. '17

• 🎓 Commitcoin: Carbon dating commitments with bitcoin. Clark J, Essex A. FC '12.

• OpenTimestamps: Securing Software Updates using the Bitcoin Blockchain Financial Cryptography and Data Security. Todd P, Halpin H. (FC Poster '17)

+- 🎓 Decentralized trusted timestamping using the crypto currency bitcoin. Gipp B., Meuschke N., Gernandt A. iConference 2015

Well I don't think we have only very novel works here. This was also published in a venue, so somebody interested in timestamping may wanna take a look for any extra stuff. If you don't have any objections directly on the paper itself (eg mistakes) I think we should add it.

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