{
  "manageEntity": {
    "action": "Save",
    "entityId": "591068521",
    "entityType": "Track",
    "nonce": "0x5726e4c681f45ddbd1f8a5da717a4e3bf34ff7b06ca56fc8c6f9621630c22cd9",
    "signature": "0x38fc27b8a15aa5ef57d55236810eb240779c3979bd3dda10482c22a44ffe555801f01192d72c9b350e7c12a539ad9e50cd7776840c8275af3b80f5472f34d7721c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}