{
  "manageEntity": {
    "action": "Save",
    "entityId": "721226615",
    "entityType": "Track",
    "nonce": "0x7052a46e5ba544a50d47e37354e8e6b27b12311b3575aa11e031d30df0f8dc32",
    "signature": "0xa1714765d79adedf87c4fe648a2f6b9eff80a9adbf3ed96e112cc2ef2898b3de3d93665ed488d4917fe491083fe10f9a3baafeee1829a784bd80f327e8b5b3e71b",
    "signer": "0xd1bC12b8b46f2FAa152aB791052b4a26826F86F5",
    "userId": "481080235"
  }
}