{
  "manageEntity": {
    "action": "Save",
    "entityId": "620884781",
    "entityType": "Track",
    "nonce": "0x0a1dc89777c0fc7f22d5db04aff664f8352347be239fbd489474400371becc05",
    "signature": "0xda2dba743716d5df7a01274c58e3c1c67508194705765bcdd2836dd67bac99310435e72340a1cd14af64ee8d5980f22f83355344664b7eef338e2efd481f5ac41b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}