{
  "manageEntity": {
    "action": "Save",
    "entityId": "719674",
    "entityType": "Track",
    "nonce": "0x615ce5435ae1eea9d516ed941d885c9156d5d9aa8987cc3aca1fc1f31caf5d15",
    "signature": "0x4e5daf856cd80455f66f09f041ea8691c6a8ede799be5a7ba5a670db58e555af6d7e20b8fda35a10abf087195f75c7d941f12711891ef420f2a3a55f620760de1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}