The OpenTimestamps standard is a recent development for blockchain timestamp proofs. It allows to demonstrate that certain information, as documents or digital signatures, exists before a certain date.

Unlike traditional solutions (RFC 3161/ANSI X9.95, RFC 4998), it achieves this without trusted third parties or long-term maintenance needs. …


La idea de esta nota introductoria es ser un punto de partida; no apunta a explicar teoría monetaria o criptografía, tampoco pretende convencer a nadie, sino contar de qué se trata y cómo nos resulta útil a muchos de nosotros.

Para ello se intenta dar una explicación básica de cada…


Citi organized a global challenge to source solutions that promote integrity, accountability and transparency in the public sector. It was arranged in 6 countries, with one of the chapters being celebrated in Buenos Aires with the support of Argentina’s national government.

We decided to be part of it exploring the…


We’ve been silently adding features to Signatura, with a new batch of them becoming available in today’s release. Here’s what we’ve been working on:

Teams

If you regularly need the same group of people to access your documents, this will be of help. Instead of manually selecting everyone on each document…


Last year we did a blog post on procurement processes such as requests for proposals or calls for tenders, and how to prevent common fraud schemes found on them. Recently, we had to further explore on that blockchain-based solution. As an addition to that post, we found these benefits:

Proposal/bid secrecy

The…


In the last month we were lucky to be part of a few events and competitions, here a brief summary of our participation on them.

Argentina’s Central Bank hackathon award

The president (center) and vice president (left) of Argentina’s Central Bank talking with Signatura during financial innovation hackathon.

Weeks ago we took part on the financial innovation hackathon organized by Argentina’s Central Bank.

There we used Signatura to build a proof of concept…


Today we are excited to launch the public beta of Signatura, our digital signature and notarization platform.

Time ago we released its private beta and signed its first document. …


We started developing BitCourt as an arbitration platform, so commercial disputes could be resolved quickly and professionally. …


Calls for tenders, requests for proposals and sealed-bid auctions, while less frequent in the private sector, are common and necessary processes on government agencies. However, no matter the good intentions for implementing them, they are still a constant source of fraud and corruption.

Their procedures usually involve one of these…


Since late ’70s digital signatures have been successfully used to provide authentication, integrity and non-repudiation of a message and its source.

Lotus Notes 1.0 (1989), first widely marketed software package to offer digital signature.

Algorithms such as DSA, PKCS #1 (RSA), ECDSA and others were or are used in digital signature solutions like Pretty Good Privacy (PGP) and Adobe Sign, among others.

Bitcoin’s blockchain background

Bitcoin…

Franco Amati

/me: alpaca-sock-wearing crypto-terrorist (bitcoiner), drapetómano (eleuteromaníaco), nómada wannabe, agorista (libertario), pro-chumbo, ateo propagandista.

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