{
  "manageEntity": {
    "action": "Save",
    "entityId": "1699819801",
    "entityType": "Track",
    "nonce": "0x49e299d5f8b167a05c2e35941f0ecc82fa002018145035df84cffbec349d42a6",
    "signature": "0x48c260c2541a52e7c50b3aa06a67552a91f64b53b5ee151a767fa58d19ec737f52594ca4818680f93b28bf4a9aeced6a13503c0c435cb308ac72fb6f4337e5651b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}