A Glimpse of Banking’s Future, Live on the Ethereum Blockchain
Last week, Frenching bank Societe Generale revealed that it has issued a security token-like bond on ethereum. But rather than using a private iteration, SocGen used the public blockchain. · CoinDesk

Michael J. Casey is the chairman of CoinDesk’s advisory board and a senior advisor for blockchain research at MIT’s Digital Currency Initiative.

The following article originally appeared in CoinDesk Weekly, a custom-curated newsletter delivered every Sunday exclusively to our subscribers.


At first glance, this week’s move by the investment bank Societe Generale to issue a security token-like bond in which it was both the issuer and the sole investor might seem like a pointless act. Not so much a peer-to-peer transaction; just a peer transaction.

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But one element of the announcement suggests this was actually an important step in financial institutions’ sometimes fractious relationship with cryptocurrencies and blockchain technology. You see, Societe Generale’s $112 million bond issue used smart contracts built not a private, permissioned blockchain but on the public, permissionless ethereum blockchain.

This was a baby step, for sure. But, let’s remember that this French bank belongs to an industry whose member institutions repeatedly posit that permissionless blockchains are unworkable for them.

Banks have made various arguments for why they feel compelled to use private, permissioned versions of this technology: because they are beholden to know-your-customer and other compliance rules that aren’t easily enforced in a permissionless environment; because their competitive interests require a level of privacy that can’t be assured in a transparent, public setting; or because public blockchain’s probability-based standard for confirming trade settlement falls short of what Wall Street’s lawyers call “settlement finality.”

Yet here was the 19th-largest bank in the world experimenting with the public model.

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It would be way too premature to say that Societe Generale has discounted those industry concerns about permissionless blockchains – concerns that are more likely founded on fears of the threat to existing business models than anything else. But the French bank’s move could also signal an acknowledgment that banks’ can’t afford to turn their back on the disruptive threats and opportunities posed by permissionless protocols such as bitcoin or ethereum.

Societe Generale appears to be placing a side bet that the future evolution of digital finance will play out much as the battle for supremacy in next-generation communications technology did in the 1990s – lest it be left on the wrong side of history.