{
  "manageEntity": {
    "action": "Save",
    "entityId": "1030953773",
    "entityType": "Track",
    "nonce": "0x977188d4fd2db117ea4eb4f3d158429fdf8e46f0b48622bd05679a8eb937a033",
    "signature": "0xbfbc0e5ebe91a27ead91e39a57663333c06c4bdb5249452901540050676362fc3742c1b010cedab2678da274f1235a66f50ef6889bf07d1ba34ad8cbbed5dd711b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}