{
  "manageEntity": {
    "action": "Save",
    "entityId": "465318316",
    "entityType": "Track",
    "nonce": "0x639a6492c9d0b049b523052881f0b6a98250ca541b71c8f167d44fc1b5bbf331",
    "signature": "0xd8c5c530265ee21a8b60d87a069187c20320b8ee0c0994cd870d97e823a762ce722d1139a44c2ee0696191c3d84d7811887a5f37e84de3483789b00011811b6e1b",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}