Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media for Interposed Secure Function Calls. One of the operations is performed by interposing a first application function with a second application function. The second application function executes when the first application function is called by another process or other code. The process or other code makes a function call to the first application function, but instead of executing the first application function, the interposed second application function is executed. The function call includes an argument payload which is evaluated for safety and security. If the function call and/or argument payload is determined to be safe, the interposed second application function will perform the first application function using the argument payload. Otherwise, the first application function is not performed.

Abstract: A system and method may be used to recover access to an account. A recovery challenge may be received from a submitter, including an escrow deposit, and the recovery challenge may be broadcast to other users. During a monitoring period, the system may monitor for a recovery response proving ownership of the account. If a recovery response is received then the submitter of the recovery response may maintain ownership of the account and receive a portion of the escrow deposit. If no valid recovery response is received during the monitoring period, then ownership of the account may be transferred to the submitter of the recovery challenge.

Abstract: A system and method may be used to recover access to an account. A recovery challenge may be received from a submitter, including an escrow deposit, and the recovery challenge may be broadcast to other users. During a monitoring period, the system may monitor for a recovery response proving ownership of the account. If a recovery response is received then the submitter of the recovery response may maintain ownership of the account and receive a portion of the escrow deposit. If no valid recovery response is received during the monitoring period, then ownership of the account may be transferred to the submitter of the recovery challenge.