{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389728",
    "entityType": "Track",
    "nonce": "0x2e3b6a1b0fa9ecc9d6bfd9705824e4ba299a854ac1921526763e0892765a2a65",
    "signature": "0x31d1ae927ff0c8f222c9f70af164396dd8dc5ede963c23d265c6367f8043e70621ac77e5b08b975f26d977eb3c2d035aea43a3a8cb67af09efe63c87acf8d51f1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}