{
  "manageEntity": {
    "action": "Save",
    "entityId": "388681",
    "entityType": "Track",
    "nonce": "0x37c23267cbe8561d6acad9aefef06e68a55156002ef8869e31c3b040c453ca05",
    "signature": "0x29dd258829b487bd6c2d0e37de15e459459c721d8a0be3f24027c9a06682f04c2484caec04a188ac09fe0c8c591ffc6349daea4e93348f7ac4de88d68de188521c",
    "signer": "0xA3B40AD9bEaDeb7a11B85d9088BaC12a3F2Eca1f",
    "userId": "199809170"
  }
}