{
  "manageEntity": {
    "action": "Save",
    "entityId": "54757564",
    "entityType": "Track",
    "nonce": "0x51d2137187a813e00f0b8d3f9aaf1faeff993495bb006e86e89d082d09139af9",
    "signature": "0x39af947a2f62558194796051b7755a6f8eb47da396eed08b916240525f1573fa5390b01248719b0c0340181e6ab60ad838b5c53be77447ec4fd7b5d64f2f75db1c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}