Quick answer: Project Stella was a joint research project by the European Central Bank (ECB) and the Bank of Japan (BoJ), launched in December 2016 and running through 2020, that tested whether distributed ledger technology (DLT) could serve financial market infrastructures. It ran in four phases: large-value payments, securities settlement, cross-border payments, and confidentiality. Its phase 3 work found that synchronising and locking funds can make cross-border payments safer, but the central banks were explicit that this was research, not a production system.
Updated 07/17/2026. By Jake Claver. Educational content, not investment advice.
Project Stella gets cited a lot as proof that central banks take DLT seriously. That is fair, but the interesting part is the detail: what each phase actually tested, and the careful line the ECB and BoJ drew around their own conclusions. This piece walks through the four phases using the primary reports, and flags where the findings are more measured than the headlines suggest.
What Project Stella was
In December 2016 the Bank of Japan and the ECB announced a joint research project named Stella to assess whether DLT could be applied to financial market infrastructures. It was a study, not a build. Across four phases from 2017 to 2020, the two central banks ran experiments and conceptual analysis to map where the technology helps and where it does not. The phase 1 report set the pattern: rigorous, experimental, and cautious about extrapolating.
The four phases in brief
- Phase 1 (September 2017): Tested large-value payment processing on DLT and compared it against real-time gross settlement systems.
- Phase 2 (March 2018): Examined securities settlement and delivery-versus-payment, where an asset and its payment change hands together.
- Phase 3 (June 2019): Studied whether cross-border payments could be made safer using synchronisation techniques.
- Phase 4 (February 2020): Explored the tension between transaction confidentiality and auditability, sorting privacy techniques into segregating, hiding, and unlinking approaches.
Phase 3: the cross-border finding, stated carefully
Phase 3 is the one most relevant to cross-border payments, and it is where precision matters. The synchronised cross-border payments report concluded that credit risk can be reduced if payments are synchronised and funds are locked along the payment chain, something that rarely happens in today’s arrangements. But the researchers added a crucial qualifier: synchronisation alone does not guarantee safety. As the ECB’s own summary puts it, “only payment methods with an enforcement mechanism, either through the ledger itself or through a third party, can ensure the safety of the principal amount.” You can read the ECB news summary of phase 3 directly. Notably, the enforcement mechanism, not DLT specifically, is what does the work, which means these safety gains are not exclusive to blockchain systems.
What the central banks did not claim
This is where a lot of secondhand coverage overreaches. Project Stella did not deliver a live payment system, and it did not recommend replacing existing infrastructure. The phase 4 report is blunt: “The analysis and experimental results presented in Project Stella are not geared towards replacing or complementing existing arrangements.” Reading these reports honestly means treating them as what they are: careful experiments that clarify what DLT can and cannot do, not announcements of deployment.
Why this matters
Central bank research shapes the direction of payment policy, and Project Stella is a well-documented example of central banks probing tokenisation and DLT on their own terms. It feeds directly into later work such as the Bank for International Settlements’ 2023 unified ledger concept, which also puts central bank money and tokenised assets on a shared programmable platform. Payments infrastructure is a repeat-use business, so where central banks decide to steer it has long consequences. That is an infrastructure and policy story. It is separate from any claim about a particular token or company’s investment merit, and Project Stella itself made no such claims.
Common questions
What is Project Stella?
Project Stella was a joint research project by the European Central Bank and the Bank of Japan, launched in December 2016, that tested whether distributed ledger technology could be applied to financial market infrastructures. It ran in four phases through 2020.
What were the four phases of Project Stella?
Phase 1 (2017) looked at large-value payments, phase 2 (2018) at securities settlement and delivery-versus-payment, phase 3 (2019) at safer cross-border payments through synchronisation, and phase 4 (2020) at confidentiality versus auditability in DLT.
What did Project Stella conclude about cross-border payments?
Phase 3 found that synchronising payments and locking funds along the payment chain can reduce credit risk, but only payment methods with an enforcement mechanism, through the ledger or a third party, can ensure the safety of the principal amount.
Did Project Stella build a production payment system?
No. The reports state that the analysis and experimental results are not geared towards replacing or complementing existing arrangements. It was research, not a deployed system.
Does Project Stella prove DLT is required for safer payments?
No. Phase 3 attributes the safety gains to the enforcement mechanism rather than to DLT specifically, so similar techniques could apply beyond blockchain systems.
This content is educational only. It is not tax, legal, or investment advice. Check primary sources and speak with a qualified professional before making financial decisions.
