{
  "manageEntity": {
    "action": "Save",
    "entityId": "761498324",
    "entityType": "Track",
    "nonce": "0x90505fe720f877492903aaa54b9bd04351574ae89a65edef4745323045ede564",
    "signature": "0xc9324d9829f9783399738f94ea8cb7658742d693e35030e9b18b80d960f8a497056a41f92bebced92425a8d7dad9774e892593bd5bc58e417aaeb81148b338901b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}