{
  "manageEntity": {
    "action": "Save",
    "entityId": "844190352",
    "entityType": "Track",
    "nonce": "0xe6385e4ea8ad7daf7e75e708eef5149486e1bca2af0c4e8b41c436c0c536055c",
    "signature": "0xf3cdc254b38023cd0acc6ebcf21090166debd54a3b45d33275ae793e8389367b388b9758d5ac6df98110cca33fdfa938574c2126c6e0f82b4f0dda243992cbb81c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}