Since the emergence of the virtual currency Bitcoin in 2009, a new, Internet-based way of recording entitlements and enforcing rights has increasingly captured the interest of businesses and governments. The technology is commonly called 'blockchain' and is often associated with a closely related phenomenon, the 'smart contract'. The market is now exploring ways of using these concepts for financial assets, such as securities, fiat money and derivative contracts. This article develops a conceptual framework for the governance of blockchain-based networks in financial markets. It constructs a vision of how financial regulation and private law should set the boundaries of this new technology in order to protect market participants and societies at large, while at the same time allowing for the necessary room for innovation

Since the emergence of the virtual currency Bitcoin in 2009, a new, Internet‐based way of recording entitlements and enforcing rights has increasingly captured the interest of businesses and governments. The technology is commonly called ‘blockchain’ and is often associated with a closely related phenomenon, the ‘smart contract’. The market is now exploring ways of using these concepts for financial assets, such as securities, fiat money and derivative contracts. This article develops a conceptual framework for the governance of blockchain‐based networks in financial markets. It constructs a vision of how financial regulation and private law should set the boundaries of this new technology in order to protect market participants and societies at large, while at the same time allowing the necessary room for innovation.

-'Safe harbour' is shorthand for a bundle of privileges in insolvency which are typically afforded to financial institutions. They are remotely comparable to security interests as they provide a financial institution with a considerably better position as compared to other creditors should one of its counterparties fail or become insolvent. Safe harbours have been and continue to be introduced widely in financial markets. The common rationale for such safe harbours is that the protection they offer against the fallout of the counterparty's insolvency contributes to systemic stability, as the dreaded 'domino effect' of insolvencies is not triggered from the outset. However, safe harbours also come in for criticism, being accused of accelerating contagion in the financial market in times of crisis and making the market more risky. This paper submits that the more important argument for the existence of safe harbours is liquidity in the financial market. Safe harbour rules do away with a number of legal concepts, notably those attached to traditional security, and thereby allow for the exponentiation of liquidity. Normative decisions of the legislator sanction safe harbours as modern markets could not exist without these high levels of liquidity. To the extent that safe harbours accelerate contagion in terms of crisis, which in principle is a valid argument, specific regulation is well suited to correct this situation, whereas to repeal or significantly restrict the safe harbours would be counterproductive.

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The practice of securities holding, transfer and collateral has significantly changed over the past 200 years-moving from paper certificates and issuer registers to an intermediated environment, and from there to computerisation and globalisation. These changes made transacting more efficient and thus rendered markets more liquid. However, the law has lagged behind and is now itself an obstacle to efficiency because international securities transactions are subject to considerable legal uncertainty. The latest global market development, a cryptographic transfer process commonly called 'the blockchain', is the most recent efficiency-enhancing change. It offers a unique possibility to create a consistent legal framework for securities from scratch, on the basis of a legal concept that to some extent resembles bearer securities. This paper shows what the new international legal framework could look like, in the light of experience gained from earlier developments.