{
  "manageEntity": {
    "action": "Save",
    "entityId": "1437249979",
    "entityType": "Track",
    "nonce": "0x683d64b2975d3a43c7673522a05acec0fca3f865979a887539a39fe1fc702273",
    "signature": "0x393b7e878e0446a0ba001e35728abaa9b435f5baf5d828e22a5cf55fb32f7d92213999401ca66a1cba283eb0f683f056cdff57c7ec5782bdbca9d7049e27d4b61c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}