{
  "manageEntity": {
    "action": "Save",
    "entityId": "494090624",
    "entityType": "Track",
    "nonce": "0x4897b906aaee7d97bb49b7b65a1f5768ff1713b289b8a4681922733c3bba3e69",
    "signature": "0xc9f7851713fba4b7269ecbcee2308c04b7f280f60fb3ebaf597e53cbaa0b9795261d43e5532afa9197e06a5322aa99a12fe9ad556b97a1397baa19bb2e4197291b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}