Adding the abstractHEADmaster

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 \begin{document}
 \maketitle
 
+\begin{abstract}
+Proofs of Space is a recently proposed alternative to Proofs of Work in which
+    the access to a shared resource is restricted by forcing the service
+    requester to dedicate some amount of disk space.
+
+    At the core of Proofs of Space is a cryptographic data structure known as
+    Merkle trees and a challenge/answer interactive protocol using this tree.
+    The question is then to understand the trade-offs in designing the data
+    layout and data access methods of a Proof of Space system to make the
+    protocol as efficient as possible.
+
+    We propose several strategies, both for the Merkle tree construction and
+    for the proof retrieval phase and compare their relative advantages from
+    the systems perspective. 
+\end{abstract}
+
 \section{Introduction}
 
 \paragraph{Proofs of Work.} Proofs of Work (PoW) were introduced in the early