{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638033331",
    "entityType": "Track",
    "nonce": "0x37f25280cc29dcee4cd558867ad28be4fe26c2e037962e9411683ef771e092c6",
    "signature": "0x634a6ed052398765f08c17306eea7481fd221c474c3de4c515db148ef1360a2858349319015d9eeb94f46976d287d3bdf1f439679bd1dfd14eec499fb7d890d71b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}