{
  "manageEntity": {
    "action": "Save",
    "entityId": "221403",
    "entityType": "Track",
    "nonce": "0xd2c5e1e5c78ed14bbeb58ef7409ec415ee6ec83e6f59cca346851e73f6e1cde4",
    "signature": "0xe154bf56468c4cb4b0bc967b9a9de657ceda88b761025ea7d0138c031bc14bee1d50e05d7c3837509a4ec1a24810a07ce0741eb8b87150c6729276b1c448fa8d1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}