Smart contract whitelists

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations for controlling access to smart contracts in a blockchain network, the operations comprising:

• identifying, by a node of the blockchain network, a request to execute a private function of a smart contract stored in a blockchain maintained by the blockchain network, the request comprising a requestor identifier of a requesting account that is requesting to execute the smart contract, wherein the smart contract comprises the private function and a main function;
• executing, by the node, the private function of the smart contract using the requestor identifier to retrieve a whitelist from the blockchain that is associated with the smart contract, wherein the whitelist is predefined before the smart contract is called, the whitelist comprises a function decorator specific to a programming language of the smart contract, the whitelist comprises a reference to a location external to the smart contract that stores identifiers of accounts authorized to execute the smart contract, and the whitelist is configured to be called before an execution of the main function of the smart contract;
• processing, by the node, the whitelist associated with the smart contract to identify, based on the identifiers of the accounts authorized to execute the smart contract, one or more accounts that are authorized to execute the smart contract;
• determining, by the node, that the requesting account is authorized to execute the smart contract based on the requestor identifier of the requesting account being included in the whitelist;
• in response to determining that the requesting account is authorized to execute the smart contract, executing, by the node, the main function of the smart contract, to generate transaction data;
• hashing the transaction data by using a hash function to generate a hash value of the transaction data;
• and
• encoding the hash value of the transaction data in a tree data structure, wherein a root of the tree data structure comprises a root hash value that is representative of all data in the tree data structure.

A system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform operations for controlling access to smart contracts in a blockchain network, the operations comprising:
• identifying, by a node of the blockchain network, a request to execute a private function of a smart contract stored in a blockchain maintained by the blockchain network, the request comprising a requestor identifier of a requesting account that is requesting to execute the smart contract, wherein the smart contract comprises the private function and a main function;
• executing, by the node, the private function of the smart contract using the requestor identifier to retrieve a whitelist from the blockchain that is associated with the smart contract, wherein the whitelist is predefined before the smart contract is called, the whitelist comprises a function decorator specific to a programming language of the smart contract, the whitelist comprises a reference to a location external to the smart contract that stores identifiers of accounts authorized to execute the smart contract, and the whitelist is configured to be called before an execution of the main function of the smart contract;
• processing, by the node, the whitelist associated with the smart contract to identify, based on the identifiers of the accounts authorized to execute the smart contract, one or more accounts that are authorized to execute the smart contract;
• determining, by the node, that the requesting account is authorized to execute the smart contact based on the requestor identifier of the requesting account being included in the whitelist;
• in response to determining that the requesting account is authorized to execute the smart contract, executing, by the node, the main function of the smart contract, to generate transaction data,
• hashing the transaction data by using a hash function to generate a hash value of the transaction data;
• and
• encoding the hash value of the transaction data in a tree data structure, wherein a root of the tree data structure comprises a root hash value that is representative of all data in the tree data structure.