{
  "manageEntity": {
    "action": "Save",
    "entityId": "770612142",
    "entityType": "Track",
    "nonce": "0x85b339fb97e0159eaf492512f9e029fabb221a3aabe04e221583890b1c5c3e64",
    "signature": "0x5465f40226cccea9ed18a194fdd9eb4e19958e15033348a9301078a2bf905a8f571c12ae567afc272ab9e67a57168d27399850d1ed9afc18cb4a8bd7f599dec31b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}