{
  "manageEntity": {
    "action": "Save",
    "entityId": "664722",
    "entityType": "Track",
    "nonce": "0x97b9ad28363ab36988ef33e0cbcb9042847634e92d123c7796ed96565e74fc53",
    "signature": "0xaa6eba11f040d564deb73ccc6e1c373062c5f3347a168861dd537581ff01912d21abbf34482c3a550d3c245e110a0f1007ae5c94500462f5ee8ee10fb2836d441c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}