{
  "manageEntity": {
    "action": "Save",
    "entityId": "263156447",
    "entityType": "Track",
    "nonce": "1785337627855915170",
    "signature": "0x6ba7d9097cb743749d4abb49aaf7f401bd06abe4323182c2fc179c289022489376c7775692f40e7406377e32fad17e8550edd3774f99565955ef4b81bd1354271b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}