{
  "manageEntity": {
    "action": "Save",
    "entityId": "778921105",
    "entityType": "Track",
    "nonce": "0x3506b8c93ec9a890472c96108913bd4033f3b6bb0fd7d629376c72eb4f8055a1",
    "signature": "0x24f52d6220e0a3222822a309e1de35a7aed64ebc35d06b020497d5f4379d49bb05bbaa3175ccd47c87c3aff1517ca52efcbeca21eefe7760c534876dc34788e61b",
    "signer": "0x4089d1751487aA665C895419F2578a6Cf33BE481",
    "userId": "728155533"
  }
}