{
  "manageEntity": {
    "action": "Save",
    "entityId": "270645737",
    "entityType": "Track",
    "nonce": "0xd5bc8b9ce4243fbfb61847d62056e4db79e2b56671e32e953286fa1b318345c5",
    "signature": "0xf6a40900a2124c22f2239e81b04bff5ee143a2e65c56872b3af0e09e8ef91dea1f2a75207dde6b0e2cb625f016b6d88697b44b18435abce65f61e77fe6fab2b21b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}