{
  "manageEntity": {
    "action": "Save",
    "entityId": "1901369912",
    "entityType": "Track",
    "nonce": "0xe28eaafb05ffbb5ed6579bd743cae31a5e03c188eb6a22c6939c0c4e5e256e18",
    "signature": "0x46cf8100a59a09773512bb878784e6fb96f395df64d19cf217a9f1c93c181cbf024708ccd4cadcb57a9675e76aa5712a6168799b1455714f8462a95c40583c551b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}