{
  "manageEntity": {
    "action": "Save",
    "entityId": "321780949",
    "entityType": "Track",
    "nonce": "0x009a0d779cd1bdedf6088db6793c614302c30d6cbdd7b98fd0909c53081eb4b2",
    "signature": "0x085bea1a269e936c567668eca69fc438b9d24e4aef969cc772bfa10cde04b1273ed87c4e01771fed6863a204fa370c4504519d7eb36dfef2a87742898d1ff8161b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}