{
  "manageEntity": {
    "action": "Save",
    "entityId": "323619",
    "entityType": "Track",
    "nonce": "0x34a4418f7f038381e7f53e438bb7c133a265dc7f5e98f704089162c768187112",
    "signature": "0x37c15350f0b9c7fdbc843b1e65375649bb300c58ed41b7124ffb909f6de1cbce2b318714f707da99bf897b60d49772fce9e40104d48b9984051bd2a8cf2c40b11b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}