{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999231493",
    "entityType": "Track",
    "nonce": "0x3b3d9e8db1038b2442c910f426d2f1bf36585468786d134c5e936079760de0b9",
    "signature": "0xae13b3b758e565156eb9d4f58428c064f0430dbde743689ef7bdb41453e6473a7493b891ced5ae7afff6161dfdb51cc0634aad3f6cbf3498c4711a421a4c9acf1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}