{
  "manageEntity": {
    "action": "Save",
    "entityId": "100898464",
    "entityType": "Track",
    "nonce": "0x9c24a8d6ea427f727f1a80144a2a325eaa15d4b9d5e0ee0d2a62c88927c191ff",
    "signature": "0xfdf754f0930f406ad6b123444cc317efd0989177a272c1edd2ba6c34ad860ba62250e46f315e0ec09c76217ebf7d1bbbe2224a38c172edf752e02ab263e2a6c31c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}