{
  "manageEntity": {
    "action": "Save",
    "entityId": "840366389",
    "entityType": "Track",
    "nonce": "0xf474f0142aabc2b63b09a634667b9fe9d3931c7a2cf6632541ca50c5046c8fce",
    "signature": "0x15c76001c92da05073fc05f308708f1a695ed3473a838afe501d998404da03f64b78932e0ad4a4730124650fa61f3b5759816c269d82a0774dc4e5670aebc79a1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}