{
  "manageEntity": {
    "action": "Save",
    "entityId": "898270499",
    "entityType": "Track",
    "nonce": "0x80b05b2c805e071a5966a0ed8fa747eb76174349ca9eae199776111a18a29c6c",
    "signature": "0xefba502bb6351f6d8caf0561e012dd4e9466cb6a007870827172fd12eac2bc267e4d7ba5cd622ecb7257610b39658d1082207bd0dc956635627779861c96a2541b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}