{
  "manageEntity": {
    "action": "Save",
    "entityId": "1277538808",
    "entityType": "Track",
    "nonce": "0xbb7b3489422b1c0383a09a86a6cc6c2e434496a13f5424ae94902e3f4fe1054f",
    "signature": "0x253a5948b2be0a007de02f278d934c78e372978f3f38a309a4591bd4918d7c95195ec984c121aee6a0bf12e11d7ebc07b8160af4a5d8d97acd39df8a68a625391c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}