This paper introduces some trust issues for blockchain transactions. Such transactions rely on ECDSA signature based on 32 bytes secret keys. Because these keys can be stolen or hacked, we suggest to prevent these risks by using javacard secure elements. We detailed the interface of a Crypto Currency Smart Card (CCSC) designed over a JC3.04 standard platform. We details two use cases. First deals with deployment of the CCSC application in low cost low power object powered by an open hardware (arduino) platform, and integrates sensor data in ethereum transactions. Second proposes the deployment in the cloud of CCSC javacards plugged to RACS servers, in order to enable the remote and safe use of ECDSA signature.
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