Originally reported by Cointelegraph on November 14, 2026, at 05:49 (UTC+8). Blockstream announced an institutional digital-asset custody system developed with French technology group Thales. The system combines Thales hardware security modules (HSMs) with Blockstream’s Secure Multi-Party Computation (Secure-MPC) technology.
Blockstream says the entire transaction-signing protocol runs inside the protected environment of the HSMs, rather than carrying out parts of the process outside dedicated security hardware. That is the company’s description of the system’s security design, not an independently verified security assessment.
Blockstream co-founder and CEO Adam Back told Cointelegraph that conventional MPC protocols can require too much communication between devices to be practical for fully offline cold storage. He argued that keeping signing devices offline reduces exposure to unauthorized network access and said AI could help attackers find subtle implementation flaws in complex systems.
The announcement describes a custody product for institutions. The report does not establish how many institutions are using it or provide an independent evaluation of its security.
