{
  "manageEntity": {
    "action": "Save",
    "entityId": "137673088",
    "entityType": "Track",
    "nonce": "1792390925237028917",
    "signature": "0xc1f90edf07e17eba32e832977497827f55ee907874d1f0d301bacb8065443aa7734d04e3c1c48dd892b9f3e584d14738ed9c6241951f539628cacf74ee88e4dd1b",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}