{
  "manageEntity": {
    "action": "Save",
    "entityId": "552812978",
    "entityType": "Track",
    "nonce": "0x879bcf8029fba1b96b6318972307825c201af0a3e124a6a6806876e25b8b0447",
    "signature": "0x2a37ff397226bfc7679d2e29719e0e1635f1310ef4f5bc3f337312c32051ee7f4c8549b547ee8bbd92dda0eb7a5bbce31b2546cb13a0d6f73d2fbf8b459e79191c",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}