{
  "manageEntity": {
    "action": "Save",
    "entityId": "754459507",
    "entityType": "Track",
    "nonce": "0xc50c6a8b3978ecf366f9cc4c1a036a2b2e8e058a8f46f162bb1533b80388dc2b",
    "signature": "0xf9af192d275d60d4622f970b91364aef8331ea90f8c826aa142535fa7266edc824262e3af28e8cf2adc6812f87c899819af1247d9217ee3574af9ae02181b2711c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}