Abstract: Telephone calls can be automatically verified by a telecommunication system using identity information about the caller. For example, a telecommunication system can receive a communication associated with a caller requesting to make a telephone call to a recipient. The communication can include a reference to a security certificate. The telecommunication system can access the security certificate, the security certificate having a public key and a document identifier. The telecommunication system can retrieve identity information from a storage location using the document identifier. In response to verifying the identity information using the public key, the telecommunication system can flag the caller as verified.

Abstract: Telephone calls can be validated using blockchains. In one example, a computing node can generate a distributed ledger indicating relationships between telephone numbers and unique identifiers assigned to the telephone numbers. The distributed ledger can be accessible to a telecommunication system for validating telephone calls.

Abstract: Telephone calls can be validated using blockchains. In one example, a computing node can generate a distributed ledger indicating relationships between telephone numbers and unique identifiers assigned to the telephone numbers. The distributed ledger can be accessible to a telecommunication system for validating telephone calls.

Abstract: Telephone calls can be validated using blockchains. In one example, a computing node can generate a distributed ledger indicating relationships between telephone numbers and unique identifiers assigned to the telephone numbers. The distributed ledger can be accessible to a telecommunication system for validating telephone calls.

Abstract: Telephone calls can be validated using blockchains. In one example, a computing node can generate a distributed ledger indicating relationships between telephone numbers and unique identifiers assigned to the telephone numbers. The distributed ledger can be accessible to a telecommunication system for validating telephone calls.

Abstract: Telephone calls can be validated using blockchains. In one example, a telecommunication system can access a distributed ledger indicating relationships between telephone numbers and unique identifiers assigned to the telephone numbers. The telecommunication system can then verify a telephone call based on the relationships in the distributed ledger.