{
  "manageEntity": {
    "action": "Save",
    "entityId": "455510238",
    "entityType": "Track",
    "nonce": "0xd3271b6cd95a43f35f87ba4818386b02371cfc75eb514b4d69bbc861e88a7a79",
    "signature": "0xe6909469fddc2e3c45c7329b4a131bd365730b3d95066e7b6af18546441e3fe76db4e93d276a5ab8d27de63d4ded5c297340aeb6ddca3a96b789fabfbe20ea741c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}