{
  "manageEntity": {
    "action": "Save",
    "entityId": "1521620153",
    "entityType": "Track",
    "nonce": "0xd338ccf59c8333a95aab4c686b934ba3b71fe1617f76b91893aa57c273ecb1ce",
    "signature": "0x303d890dbc3f1a08b31cee1e99f03f46d1561db81831ae3f520ec22e774182c27987517c5933a91569565f9de4720ad3c00aedf46aa5051c5001b17932f3c60c1b",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}