{
  "manageEntity": {
    "action": "Save",
    "entityId": "1879701998",
    "entityType": "Track",
    "nonce": "0x04b8056c5cee136bca5c5260086cdc36b8138ceca78f4d26edc2de5e508a67dd",
    "signature": "0x70fa409dadeffbc96d23ccb7655ae08cc3dd0da2ae11c167b6b5b5134f77fe1451f41756ea3b1c6f0a9e034b23c0b34e11f67312e8181d4a23ac4d86de6b953d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}