{
  "manageEntity": {
    "action": "Save",
    "entityId": "750405916",
    "entityType": "Track",
    "nonce": "0x91c410ecfd0edb952ade44a5ca5703ea2120952dd443f121556bc57919855f3e",
    "signature": "0x0d85e4f7a92249a11772a1e7df18e1d25a7f385b99c3e309cd0431f36ed36f676cdeca512437811979586812798806c828f7d7491976d00d7077125ecfd719b91b",
    "signer": "0xE0EaB915C3153F4a2DF5C6e7b8D58dAc829Fbf2f",
    "userId": "774741623"
  }
}