{
  "manageEntity": {
    "action": "Save",
    "entityId": "698752",
    "entityType": "Track",
    "nonce": "0x01a8d4549080bf0fb25d32989e5e1047f1930b2acfc66ee7c81e619adf840c48",
    "signature": "0x11158acc433064cab992c898c25c8adccef00d17d304f01a4375c893ba20491920bc0664235d4b574822acdae90314ef4a686cbeaac2d51351d3918586e092b41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}