{
  "manageEntity": {
    "action": "Save",
    "entityId": "350158530",
    "entityType": "Track",
    "nonce": "0x4e536e043bd3901d56ac57d8aba05ffa8563608356d3e10eda3f77721f5de8f4",
    "signature": "0x078dc5a76407aaecf38f36e25c211254ea863f67931c80dfd279b222fc4d623e56243ce2f664b183e01176bea5ba2d2d336e1fe90c304880e8e6316f725be4cd1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}