A computer-implement method comprises: selecting a trusted computing node via smart contract on a blockchain; completing remote attestation of the selected trusted computing node; writing secret information to an enclave of the selected node; causing a thin device to establish a private connection with the selected node without revealing the secret information; and causing the selected node to act as a proxy on the blockchain for the device. Another method comprises: receiving a signed device access request from a device owner; validating, by the verification node, the received request; executing, by a verification node, a smart contract on a blockchain based on the received request; and producing, based on the executed smart contract, an output command to access the device for the device to validate, decrypt and execute.