{
  "manageEntity": {
    "action": "Save",
    "entityId": "490883893",
    "entityType": "Track",
    "nonce": "0x27396b0c917f653b1a4523049ec7f5b4b3172d05cdcb1dd0664051ca59aa7c7a",
    "signature": "0x2be250ba8a721aba46c23a79152f914c44385aa78bbcc853ef9dd76183eae2c752ed62c64f8944ae1a526ce16d7383e450c2fd85dc9e604b22580fb2bbe9af8b1b",
    "signer": "0xB72b13B2ba73324ef066ef1Faa3E98A097395BeE",
    "userId": "642964026"
  }
}