{
  "manageEntity": {
    "action": "Save",
    "entityId": "990511158",
    "entityType": "Track",
    "nonce": "1790454740898927133",
    "signature": "0x7fbca9c214c15a6e00398cb51f1b4595a971936b8bd25e3c3bac279c7a74aa564dacf8430eb00524a486ccb1f9c605f785e4e8b40b98d47afb21d90e0d0f452a1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}