{
  "manageEntity": {
    "action": "Save",
    "entityId": "2072975453",
    "entityType": "Track",
    "nonce": "0x42f3095403f478ab7d83301ac6d0012bebe8dde5de700017211a15c0b92f6b6a",
    "signature": "0xb98c4b53322b727bcb9fbbf3bf481977fba212b493cda3f0548e52bbf44ad83b3390a81ada41d8f0bfe925c68f4094f76e6569cc8e8cc9b75bdbee7bccddb93c1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}