{
  "manageEntity": {
    "action": "Save",
    "entityId": "670546",
    "entityType": "Track",
    "nonce": "0x74ffb25b8bcd7e3b73c158ca8b993a9cdef713d5c0425f8d7b9cdb26d2442c71",
    "signature": "0x3dc087c56135e863faf5be5f94ef16327a57f4ca0425becc410f8bb058a249676f9377fc9538698c5867731952a72fd838b87a6f3562e065414cb12b54d881011b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}