{
  "manageEntity": {
    "action": "Save",
    "entityId": "57745",
    "entityType": "Track",
    "nonce": "0x3e7672cb6dd7e082e10a1c122f6be090811570e18a793d2b629901d330ef89fd",
    "signature": "0xfd96d62717aa79734509c0c49f03bf187dd3cc35c2d1608e8fe424189a9fa5d918cde2637af92d5f225f10b93ffd734b1c8788cd0da4af1af4cbcf82350909431c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}