{
  "manageEntity": {
    "action": "Save",
    "entityId": "738803820",
    "entityType": "Track",
    "nonce": "0x4abdee149fc6f0d8db64a592101d13486e7c562874fb2f6598aa7818ee6e93fe",
    "signature": "0xd15b2484b7053c8697f1f31a5125a191ba2ad141bea4eafab1114c8c905ca27d7df239dce6438db8c67b699fa1ded8234873722866498ed44d043bb9a57feafc1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}