{
  "manageEntity": {
    "action": "Save",
    "entityId": "658826872",
    "entityType": "Track",
    "nonce": "0x1ad619a9df9a637b190a60c2d2687a6f187b4f72fb2f15eb9d368a56c63786a9",
    "signature": "0x643c0693238f44028cae3eae1b31fe0e9f4ff0db4d73e710225c241257f5027b4844a2bf53798b40b87d2ef28f0749d95e5421ff03b5ba7274e96c9f40f653771c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}