SKAdNetwork 2.0 verify sample https://developer.apple.com/documentation/storekit/skadnetwork/verifying_an_install_validation_postback $ openssl dgst -sha256 -verify apple_public.pem -signature signature.bin message.bin Verified OK Sample postback { "version" : "2.0", "ad-network-id" : "com.example", "campaign-id" : 42, "transaction-id" : "6aafb7a5-0170-41b5-bbe4-fe71dedf1e28", "app-id" : 525463029, "attribution-signature" : "MDYCGQD0AdGn5gUnSuVGk8Wi0IgxzWiKdBzwJrQCGQCJfkrI5bda93EC4Xm1H+MtNxstFmnVBn0=", "redownload": true, "source-app-id": 1234567891, "conversion-value": 20 }