{
  "manageEntity": {
    "action": "Save",
    "entityId": "990656822",
    "entityType": "Track",
    "nonce": "0x87ffbf414df6ae1ce281cfb5073ae73939776d81b4cc4a6b24cec361a081734d",
    "signature": "0x3c6c88eaf69c92506b58cbf7919e72bb45659576652c78b7243bb93e98d62ec0170298702118250e542887fc045f460171103709da5e6f74ede879384becd1d11c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}