Abstract: Fixation system for engaging tissue of a patient including an implantable fixation device having a first arm and a second arm, a first proximal element, a second proximal element, and a coupling member. The system includes a delivery device having a catheter, a shaft extending through the at least one lumen of the catheter, a first proximal element actuator and a second proximal element actuator. The second end portions of the first proximal element actuator and second proximal element actuator can be coupled to at least one of the shaft and the coupling member.

Abstract: The disclosure describes embodiments of systems, methods, and non-transitory computer readable storage media that utilize a transaction request fraud detection model with a harvesting threshold to detect account number harvesting from network transaction requests. For example, the disclosed systems can identify network transaction requests from a transaction facilitator computing device and transaction request response codes for the network transaction requests. Subsequently, utilizing a transaction request fraud detection model, the disclosed systems can determine that the number of network transaction requests that include declined transaction request response codes satisfies a harvesting threshold indicating an account number harvesting event. In response to the indicated account number harvesting, the disclosed systems can send a selected transaction request response for responses to additional declined network transaction requests instead of one or more original transaction request response codes.

Abstract: Systems and methods for fraud management using a distributed database are disclosed. The system may receive a payment request and generate a payment request hash by cryptographically processing the payment request using a hashing algorithm. The system may invoke a fraud reporting smart contract by passing the payment request hash and a public blockchain address to the fraud reporting smart contract. The system may query a local blockchain database to locate a fraud report matching the payment request hash to determine whether the payment request has been previously reported as fraud. In response to the payment request hash not matching the fraud report, the fraud reporting smart contract is configured to write the payment request hash to the blockchain as a second fraud report.