{
  "manageEntity": {
    "action": "Save",
    "entityId": "951556",
    "entityType": "Track",
    "nonce": "0x8181e734f5201e2a66e473680e7b953619e0439a1c00ef061ac4cb312fdf3ab2",
    "signature": "0x24ffc121173b2a4ded72c211e2d3675583940f66627e9b4d6de576d0803b2b0d5fff3177d5dffdb0e2c42f94718f2d8dd155eaa6c1dac52f9d4f32b9a218b01b1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}