{
  "manageEntity": {
    "action": "Save",
    "entityId": "548896355",
    "entityType": "Track",
    "nonce": "0x1f792a1930adaad63ad5751916fb35fc8fcb3043ed04d53c5318a0d424c8c780",
    "signature": "0xde1473bbc01873b90c916c7beeab7cae880cf2909c84f5a2f785fc3302991b2c06234ff2d0e32e47d8bfd712ee5940f3f0481a8cae620a338dca3fe96f1b21161b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}