{
  "manageEntity": {
    "action": "Save",
    "entityId": "2143140612",
    "entityType": "Track",
    "nonce": "0x5f8f1c40d82316771c08e2d4d228c004675d3296a411b69f0aabda7c4c01f4c5",
    "signature": "0x7e4aa0c13a838948bd4cf102fa173749418247494a49efe71c1aa90bdceac017186f97db6e00c3670c48bef5d1c6cebc35648f3cc5d3f5c206881ad3169dd8ba1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}