{
  "manageEntity": {
    "action": "Save",
    "entityId": "745757118",
    "entityType": "Track",
    "nonce": "0x3989363d074297f6580b2c8f0cfbc4af5819d9bfbbad2717fcfc4c6f98f8ed98",
    "signature": "0x864f505b076ad92f3380c3b1fabf1ab6ff7fc3252f182922f0d587c0b2eaf2cb6fceaeb1883b365c6cd6dbdbf57bfd721c13b0de0fb5741dfc7b86a88b0954d11c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}