{
  "manageEntity": {
    "action": "Save",
    "entityId": "475238587",
    "entityType": "Track",
    "nonce": "0xffea8789519afa2076ac6bffdfae448e03d13e24181624bea16836fa606f151b",
    "signature": "0xf332569fff6449dd8eda325d0baa78bece1b64a554363fe12d92d5b3eb2902363c81a43ae9cdbf271e0cc2924597983d9feec3a728906e42a4fe54a17456c5601c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}