{
  "manageEntity": {
    "action": "Save",
    "entityId": "723490",
    "entityType": "Track",
    "nonce": "0x3a8053290d06134b5d075b3532f0aeff1cfb4741c14d59717b5116e2d1eff4de",
    "signature": "0x88bf7b017a27ffa8136c949c6ba0f9e8540258a517855bb2ce7ce3e1316b7f613ae9824fd0ba323796be8bc04d6b43c9cb1429dcd7b41367025cc6a089d2dc041c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}