Abstract: Notification system using a blockchain system. A method of the disclosure includes determining, by a node of a blockchain system, that a notification is available for an application of a computing device. The application is associated with a service platform. The method also includes updating a ledger of the blockchain system to indicate that the notification for the application is available.

Abstract: Signaling system for public switched telephone network (PSTN) using a blockchain system. In one embodiment, a method is provided. The method includes determining that a phone call related operation between a first telecommunications operator and a second telecommunications operator has been requested. A public switched telephone network (PSTN) comprises the first telecommunications operator and the second telecommunications operator. The method also includes updating, by a node of a blockchain system, a distributed ledger to indicate that the phone call related operation between the first telecommunications operator and the second telecommunications operator has been requested. The method further includes analyzing the distributed ledger to determine if the phone call related operation has been approved. The method further includes proceeding with the phone call related operation in response to determining that the phone call related operation has been approved.

Abstract: Encrypted multi-stage smart contracts are disclosed. A smart contract that is to be performed by a contract executor in a plurality of successive stages is generated. For each respective stage of at least some stages, a package of data is encrypted with at least one key to generate an encrypted package that corresponds to the respective stage, and an envelope that corresponds to the respective stage is generated. The envelope includes a condition precedent confirmable by an oracle, and an encrypted package-decryption key that is encrypted with a key of the contract executor. The encrypted package-decryption key, when decrypted, is configured to facilitate the decryption of the encrypted package that corresponds to the respective stage. For at least some of the stages, the encrypted package comprises an envelope and an encrypted package that corresponds to a next successive stage.

Abstract: Providing smart contracts including secrets encrypted with oracle-provided encryption keys is disclosed. In one example, a contract creator encrypts sensitive data necessary for executing a smart contract into ciphertext using a symmetric cryptographic key K, and also encrypts the symmetric cryptographic key K into a wrapper using a public cryptographic key e of a contract executor. The contract creator then generates an envelope using a public cryptographic key o of a contract oracle, where the envelope includes the wrapper encrypted using the public cryptographic key o and a policy that includes condition(s) precedent and is digitally authenticated. The smart contract, including the envelope and the ciphertext, is deployed to the contract executor. The sensitive data thus may be provided within the smart contract itself, while being protected from unauthorized access in the event the smart contract is malicious or is compromised.

Abstract: Providing smart contracts including secrets encrypted with oracle-provided encryption keys using thresholding cryptosystems is disclosed. In one example, a contract creator encrypts sensitive data necessary for executing a smart contract into ciphertext with multiple symmetric cryptographic keys using a threshold cryptosystem, such that a subset of at least size R of the symmetric cryptographic keys are required to decrypt the ciphertext. The symmetric cryptographic keys are encrypted into wrappers using a public cryptographic key of a contract executor. Envelopes are generated using public cryptographic keys of corresponding contract oracles, where the envelopes include the wrappers encrypted using the public cryptographic keys, and policies that specify condition(s) precedent and are authenticated using the public cryptographic keys. The smart contract, including the envelopes, the ciphertext, and R, is then deployed to the contract executor.