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International audience; Corporate financing has recently benefitted from innovative technics and solutions based on the blockchain technology. In order to analyze them, this article proposes a theoretical framework based on risks: market mechanisms, information asymmetries, opportunistic behavior, legal guarantees and operational risks. We develop a typology of financing instruments through two dimensions: means of exchange and contracts. A study of four situations supports this classification and demonstrates the potential of blockchain despite the appearance of new risks.Le financement des entreprises bénéficie de l’introduction de techniques et solutions innovantes fondées sur la technologie blockchain. Afin de les analyser, cet article propose un cadre théorique centré sur les risques : les mécanismes de marché, les asymétries d’information, l’opportunisme, les garanties juridiques et les risques opérationnels. A partir d’une analyse de la littérature, nous développons une typologie des modes de financement en nous appuyant sur deux dimensions : les moyens d’échange et les contrats. Une étude de quatre situations appuie cette classification et démontre le potentiel de la blockchain en dépit de l’apparition de nouveaux risques.

International audience; Since cryptocurrencies were first created, the related markets have been known for their fluctuations, whether in terms of high volatility or illiquidity. Partially for those reasons, public authorities and regulators around the world have frequently attempted to regulate those markets. We aim in our study to examine whether cryptocurrency traders perceive market regulation in a beneficial way. Using an event study methodology for daily data covering the 2015-2019 period, we assess how regulatory news and events have affected returns in cryptocurrency markets. We further assess whether financial cryptocurrency characteristics and in particular their liquidity can explain cross-sectional variations in cryptocurrency return reactions. The results suggest that events that increase the probability of regulation adoption are associated with negative abnormal returns for the cryptocurrencies concerned. We also find that the magnitude of the return reactions is not the same across all the cryptocurrencies in our sample. We show that investors reacted less negatively for the most illiquid cryptocurrencies and for those that incurred more information asymmetry risk. Finally, we analyze a longer-term effect of regulatory events by studying the performance of cryptocurrencies. The risk-adjusted return in the preevent period is positive and significant, but it appears not to be significantly different from zero in the post-event period.

International audience; Bitcoin is foremost amongst the emerging asset class known as cryptoassets. Two noteworthy characteristics of the returns of non-stablecoin cryptoassets are their high volatility, which brings with it a high level of risk, and their high intraclass correlation, which limits the benefits that can be had by diversifying across multiple cryptoassets. Yet cryptoassets exhibit no correlation with gold, a highly-liquid yet scarce asset which has proved to function as a safe haven during crises affecting traditional financial systems. As exemplified by Shannon's Demon, a lack of correlation between assets opens the door to principled risk control through so-called volatility harvesting involving periodic rebalancing. In this paper we propose an index which combines a basket of five cryp-toassets with an investment in gold in a way that aims to improve the risk profile of the resulting portfolio while preserving its independence from mainstream financial asset classes such as stocks, bonds and fiat currencies. We generalise the theory of Equal Risk Contribution to allow for weighting according to a desired level of contribution to volatility. We find a crypto-gold weighting based on Weighted Risk Contribution to be historically more effective in terms of Sharpe Ratio than several alternative asset allocation strategies including Shannon's Demon. Within the crypto-basket, whose constituents are selected and rebalanced monthly, we find an Equal Weighting scheme to be more effective in terms of the same metric than a market capitalisation weighting.