{
  "manageEntity": {
    "action": "Save",
    "entityId": "498287695",
    "entityType": "Track",
    "nonce": "0x71abc8366f8d32bbe3b676e62832f7587138ef911903b245b2c86a725bbfa360",
    "signature": "0x42b81cb6f2d23c9a686df2726b68782a887e6d3d5b41e4bacfc39768501c7ac04a5e4d8df5ab28f1d990eb863f93c2e75d045ee8b5632b36ca329b35ce4e7f681c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}