{
  "manageEntity": {
    "action": "Save",
    "entityId": "1501655946",
    "entityType": "Track",
    "nonce": "0x0be41a7a12107521d540aba4c058c725b22716798bf89ed52f402bec9a02d614",
    "signature": "0xba03fb5415a6cd08ff37c3e4b052d875c42867a7f2c7b0bcedc0a35b7642164b6b821f2b8738930fc9b6a8f59c6a07e096a7e7dc34abaa8a875eb1aed8ed83151c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}