{
  "manageEntity": {
    "action": "Save",
    "entityId": "591862",
    "entityType": "Track",
    "nonce": "0x8c8b3e4c1d973d60845a85af2a6d3de2173aec5551e78f57e1839d5be42c441e",
    "signature": "0xae0108fe5660479c60b788c9e349ce75536341408bd380c0502500e5a44924465b08bfc9c041f36ce8806080a638a6b3438bda4cb4e2f9493ffd90c3f47830a31c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}