{
  "manageEntity": {
    "action": "Save",
    "entityId": "903355097",
    "entityType": "Track",
    "nonce": "0xdc5ae4a764b8973d47ab595ec3eb613bec56bcaf41571b3a8c52459f6a6a0db3",
    "signature": "0x2ce9da4d8aca9620a4d8eb827001abfdba6afe2ca2f697ab2d5755b4a8fd0ec51735bb0739db87fe93127a3120ee9bff4eda44b109b28b222aa8cbff8b051c741b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}