{
  "manageEntity": {
    "action": "Save",
    "entityId": "84321214",
    "entityType": "Track",
    "nonce": "0xf03b254fc31fab3e5627c773cbb288322916f54e29b223ad7c1659227bece0ab",
    "signature": "0xb223b0cbe237fda35614953c9b5eb5f49c53a9c881868674642709348b7abb173a358b0ad782eb19ce4bc0c5a30338cd29de91ba1ef088ef943800c566f5e0301c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}