Abstract: A method for operating a mining pool includes running, by a mining pool operator, a blockchain node and at least one enclave. The blockchain node is connected to the enclave as well as to a blockchain P2P network and to a publicly available site. The method further includes checking, by the blockchain node, validity of incoming blocks and transactions received from the blockchain P2P network, and forwarding information on the received blocks and transactions to the at least one enclave. The method further includes creating, by the at least one enclave, a state transparency log and inserting the block and transaction information received from the blockchain node into the state transparency log, and signing, by the at least one enclave, the state transparency log and publishing the state transparency log at the publicly available site.

Abstract: A method for executing smart contracts in a cryptocurrency, in which a state of the smart contract is stored on a blockchain of the cryptocurrency, is performed by a contract creator and includes determining a distributed set of service providers. A smart contract is deployed and a trust model is defined that allows the distributed set of service providers to perform a transaction that effects a state transition of the smart contract in a case that a predefined or configurable quorum of the service providers of the distributed set of service providers attests to validity of the transaction. Contract execution is offloaded to the distributed set of service providers and, in a case of achieving the quorum, the state transition effected by the transaction is included in the blockchain.

Abstract: A method of preserving privacy for usage of a lightweight blockchain client in a blockchain network includes using, in a full blockchain node of the blockchain network, a trusted execution environment (TEE). A secure communication is established between the lightweight blockchain client and the TEE. The TEE receives a request from the lightweight blockchain client for at least one transaction or address of the lightweight blockchain client. The TEE obtains unspent transaction output (UTXO) information with respect to the request from the lightweight blockchain client from a UTXO database by oblivious database access using an oblivious RAM (ORAM) protocol.

Abstract: A method of preserving privacy for usage of a lightweight blockchain client in a blockchain network includes using, in a full blockchain node of the blockchain network, a trusted execution environment (TEE). A secure communication is established between the lightweight blockchain client and the TEE. The TEE receives a request from the lightweight blockchain client for at least one transaction or address of the lightweight blockchain client. The TEE obtains unspent transaction output (UTXO) information with respect to the request from the lightweight blockchain client from a UTXO database by oblivious database access using an oblivious RAM (ORAM) protocol.