{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402717284",
    "entityType": "Track",
    "nonce": "0xabe5f2b2348763f0b5c2f017b692129b8bbdcc1d41b180858859a51ca19020ea",
    "signature": "0x2703111690cf778f816eaf3b487145a5aa695eaa1bb5f1b6678c3a2faeb42e3e6a14bce203ae5aa6fede5c976cad5ba8fd563195ea33f6df8e76dd73085d0efe1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}