{
  "manageEntity": {
    "action": "Save",
    "entityId": "478939373",
    "entityType": "Track",
    "nonce": "0x47a1272431b69a19c312270aeef1b74d4628ff54b9072f2ea5138557ed4f224c",
    "signature": "0x2eee9dc35393787538d6d7b5123c879869716098d68566260e74c300f6c367753d4cc9091e67258f94809f45f27b1a1e08e4bb49e5ace3a7e2343f3b8603175d1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}