{
  "manageEntity": {
    "action": "Save",
    "entityId": "564430",
    "entityType": "Track",
    "nonce": "0xc81cac0949d9720cb606155cc07fe7b1f08030d3ffa84ef9109c879edd7471bc",
    "signature": "0xd473cfcd4891d9e6a0f8198555e777d4ae33c9b0b43405670707664f6b5dab2018cd269caea6b1f77e81cee849ff9994b0145635cb72c65884aeb6d6fc656f511c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}