{
  "manageEntity": {
    "action": "Save",
    "entityId": "439115047",
    "entityType": "Track",
    "nonce": "0x3cf5d1705ba8f43b05f659befdacbcd82326b26447dd0fc3459d0ce8eb24fe54",
    "signature": "0x79f832448d36a740a5d99386fb097eaf8ecb38cceb3fdf010e5493adc0931c836e4076ba9ca8c06578e9e5056ce22c146d0f51cb72557d9fe23fcbb2756dd2921c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}