{
  "manageEntity": {
    "action": "Save",
    "entityId": "2144198654",
    "entityType": "Track",
    "nonce": "0x52105edee6e623d6379581a1dcc56d24c3c2ef0244780b77a55835b6f5c132b9",
    "signature": "0xaf3de726a2ca05a3407ace6c54bc701528546b19d59d43974eb6989b3782e54951f6e413a6a8acdcbed904b394e027c1ad656629fddf9374f844edcc7510a4f41c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}