{
  "manageEntity": {
    "action": "Save",
    "entityId": "446856402",
    "entityType": "Track",
    "nonce": "0x5fa0d33b7e172a47f54bd64610b56cb1c12fdb544a9b69dfb2052f7e65b39ff3",
    "signature": "0x57b6f0d1a53bd9e3df790cd87abf951857e074b4169b6bd13937b55664c395f32120227b0eea701226d24ed49bb94c4b6fd5b347f1f7b92d7bf9a0b102b46e171c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}