{
  "manageEntity": {
    "action": "Save",
    "entityId": "1203723984",
    "entityType": "Track",
    "nonce": "0x5d10aaf6e7eb39a2d3828a264589aaf4199db013de0d6c441987903264f492e3",
    "signature": "0xe151de0e48aff6dfc3f3b5e212160dbcc18e7b2ee5bf174b74fab04d42c2b1597933bfa7a19ce505a94a786e3bc2e7928226147b439472801c781cea5e691a8d1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}