{
  "manageEntity": {
    "action": "Save",
    "entityId": "287836808",
    "entityType": "Track",
    "nonce": "0x2f87b9952c2e90bd5149a52abaa06a7ef464e5a89b20d79826b99ef9246becba",
    "signature": "0x4e3ee5357a68554447cbb3a59cacb9c45b18c9c0560d9636a703df177cacc34974ffb05dda37a7f2a927b85ea73e9ce9f0a0380fadb6b7429bfe246d5aabedaf1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}