{
  "manageEntity": {
    "action": "Save",
    "entityId": "1708319776",
    "entityType": "Track",
    "nonce": "0x1b9f9af9a0c45fbb3ae578bee82a226752c024cb43c235561dddd72b96834054",
    "signature": "0x7b70c74583276a9b01e8bc0d390d36d6e5be075eec85729f56432ffe2696defc44b0570aa068e39a840be9571d418965efa33618f810833a88f46fcbb012aead1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}