{
  "manageEntity": {
    "action": "Save",
    "entityId": "1003949316",
    "entityType": "Track",
    "nonce": "0x5b9ac031933bc4c7d32795c5f936c61395c805ce2048fe8fb66ec8961215cf00",
    "signature": "0xb397770ce27fb075b192a67c917e164000eca57689130a737c10c4386a6e35b540b10b3b541b111e18305d7ecca577489f345aad5b8d8e5c99dad016651779021b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}