{
  "manageEntity": {
    "action": "Save",
    "entityId": "299627",
    "entityType": "Track",
    "nonce": "0x7fe91976b9f0097f7aefbeb28ffdc6254f1252be2aefcd91c1e67878f799a25c",
    "signature": "0x9d1b6632123a68dd7adc39b5c406f5fe677b1be37497e7325b46292435775448770db34539d009c23cfb6d0d6e2a09c48a1c78ed46bc133a0a873b8b784bd9751c",
    "signer": "0x98591a180A20DF036EB2C9D2c24B449E65939Df5",
    "userId": "338604526"
  }
}