{
  "manageEntity": {
    "action": "Save",
    "entityId": "442742709",
    "entityType": "Track",
    "nonce": "0xdceff8b2b0ddabe0d12530354669137b63fee8c089b7531fa893c6c54fc87a73",
    "signature": "0xa5c40cfa46279dc600cfac853674addd2dbcff29172fa0a9c6737b78bd70da9448312178c70ee05168579d00e0364d6c9048cff54901a03105e1b5815a52a3171b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}