{
  "manageEntity": {
    "action": "Save",
    "entityId": "502501083",
    "entityType": "Track",
    "nonce": "0x1f6f4475abdc11fd94a8ed13643c95c6f6aab850f08c7affe46db30635409466",
    "signature": "0xd9244bb94ea13eb8011a55e99b290f63e870db98f7d4e9e044113fda17652cb162f80922b82adafa6ca045649479e2049a38399ce6cf5a210806d318fa8fa4871c",
    "signer": "0x71B8B1Ada9007B065F72f30543e6E310d061605D",
    "userId": "63219485"
  }
}