US Patent 11277261 Blockchain-based tracking of program changes

In some examples, in response to detecting addition or update of a program component of a program, a system creates a blockchain entry for addition to a blockchain register, generates a hash based on the program component, and adds in the blockchain entry a signed hash produced by encrypting the generated hash. The system publishes the blockchain entry for the blockchain, the signed hash in a blockchain entry useable to detect tampering with the program component.