{
  "manageEntity": {
    "action": "Save",
    "entityId": "251859",
    "entityType": "Track",
    "nonce": "0xf1bce02b2dde0d9533123d20c58993829b525980635e144e8557340ee266eb6f",
    "signature": "0x9de666700e164d2d278adef8a28973997af95b0267f0f78f1b608c0627b6b91520561b80fa701d2471653449c595a219e1aae5ac628d148a6a45eae9fe4351dd1c",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}