{
  "manageEntity": {
    "action": "Save",
    "entityId": "578206257",
    "entityType": "Track",
    "nonce": "0x8f1d32ccf1a14b9734f6a1445d2c4e12aa89e9e023a091ddd6f0cb5a82c31222",
    "signature": "0x38577077e36364bbb1cebe79eeb45ecd9aef0f2c21b2c1566d243ce15653fc8604ecc1c221105d1eefcd447c6f848448fb2b15bd8ac2a970ade10398302bac7c1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}