{
  "manageEntity": {
    "action": "Save",
    "entityId": "1227728489",
    "entityType": "Track",
    "nonce": "0xa63388bf834a36c3402c52d3a22f889609f72daf142152eee97d18d41aa0a98e",
    "signature": "0x3601a375cbdf28344518928971d89e0f201233c10a7982745a941b3b30c46d8d2c5cf1d255b86cae4b78fc4b32b28df4ecb6a2eec55638990caf03400730a4b11b",
    "signer": "0x9765cbE8e26a2c6c4847C1B69ABeB0B5250EC254",
    "userId": "678556080"
  }
}