{
  "manageEntity": {
    "action": "Save",
    "entityId": "637397980",
    "entityType": "Track",
    "nonce": "0xf8c89711d1c48e7a5692529ae2c6efabc2bdc6881879f64490f7acd4cf6d628c",
    "signature": "0x8e4edea962e18add25732349e39fdf789d6562c809d297de712e2b0a0ae6b5ec65521d71b4be61ef072880f8a228af8f4764f7380b3564f9cd363c100f39ca4d1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}