{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890723534",
    "entityType": "Track",
    "nonce": "0x6696d89cf74145e7818525cf147a3ab6c0ec64d1962293d84f847b0d77e81e82",
    "signature": "0x3f3ed170fb3e346c48fd39b9faf7d662baf7a9aa373074500acafb8b47919b05455e595e38b3dbe485eeea5f1c989436713942c9b21508b1f57cb151ee46e7cf1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}