{
  "manageEntity": {
    "action": "Save",
    "entityId": "642148279",
    "entityType": "Track",
    "nonce": "0x7d0eaf919de371dc92b09e621d67b14dcf232cb417ca78bc02d2e6523e0df96e",
    "signature": "0x08c22890136ba11b7f1e109b08c4281578a5af01526233306b2cbcf093e2068a5f25321d2c24d6b3d72eb082ba7c3c5592cbd31d2ea4704d64a6bc6208e85bc31b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}