{
  "manageEntity": {
    "action": "Save",
    "entityId": "215692409",
    "entityType": "Track",
    "nonce": "1785444684665550891",
    "signature": "0x58f041c8c4fea1a3d5e02f1ebf366a61813aa9c0ac25eb82f5fbedcd41ebbd8a6444c5b378ab9cf560a5bc3f754b57e20d01335aea9825194fe4ac4ef734a2701b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}