{
  "manageEntity": {
    "action": "Save",
    "entityId": "148682",
    "entityType": "Track",
    "nonce": "0x298b7590d9c80ad4c34bf731136a56f408ae286f6394e9c5b2992dbe24ac3744",
    "signature": "0xae5886c5b68545e4a45cd14c874e51e1860e8306bea9a0782e65dfcdc12be54214e39c1b09767bccd4ea899b87ddf2c7a0a0a0ca8c3732a3a2a62f40209dab491c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}