{
  "manageEntity": {
    "action": "Save",
    "entityId": "474573",
    "entityType": "Track",
    "nonce": "0x69bf722331ae0300a9f5070f9e057df89ca9592e769bef8cce702fc7ae04cdd5",
    "signature": "0x41f3d4990dae77f69c03feb61fc8d473985ea336cfc5799baf372c24699115210ea176299dd82fc911c76a2691d8a84206bd1eecdcd357fbb6e3f4a4ef89dc2e1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}