{
  "manageEntity": {
    "action": "Save",
    "entityId": "221935726",
    "entityType": "Track",
    "nonce": "0x50d96db4f8555975f4af5da7b68dc7bc21ee43b20c40483622352a7bd297f6dc",
    "signature": "0xd457a20603a16e557d0b107a22eb66ee2baab48f6f318d5c2682182d92c708dd0df7aea406561b08665aae1b998771a5cb6cee9a0de305a509969f30be8bc5c31c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}