{
  "manageEntity": {
    "action": "Save",
    "entityId": "775907867",
    "entityType": "Track",
    "nonce": "0x0201795d72b3c72bbacf0284aa3ab25a0ea603867b5efc6e7c78769cb947d283",
    "signature": "0x46f692adfd69030402addb93a4544d030362409e300c4b9608b020be10b4015d3f9b854f6bbf452c62f29348a5b49dd77904b05386b33d6c435236dec1fb4c8d1b",
    "signer": "0xdA0eFB0e7b973C487c12501759aDb23012CB5248",
    "userId": "178070"
  }
}