{
  "manageEntity": {
    "action": "Save",
    "entityId": "907187",
    "entityType": "Track",
    "nonce": "0xd03e8caf733634d67f35d48728bebcd18955f65fc08bff28d28cb006ad554533",
    "signature": "0xb0d3a6e0a20b9267471b2c9871a54967448210a764dc1e68f1eeda8f619e84bc772ab7e8f239e73888be4b575b4ecf1d4c5fbee182cebeb6c3286f6c2b2dbc411c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}