{
  "manageEntity": {
    "action": "Save",
    "entityId": "649149014",
    "entityType": "Track",
    "nonce": "0x83acba7d5e3e922967f4c2cb291eea1c3331112d19c63fd660ea0ba6eef854d0",
    "signature": "0xd8f907e5f55d81245c74488dddd2b5cd098d7fc27d1fd56f379e7c2d5b8ca16f5922ad8bbd63b283f0a292866476f1d7beeac9d7b1613afcbc0b9506856481e31b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}