{
  "manageEntity": {
    "action": "Save",
    "entityId": "1321239615",
    "entityType": "Track",
    "nonce": "0x5ea5a367299cf18fab7d6ff24390a746bb2c94ca11ade5cac9999b9060829745",
    "signature": "0x875705423d4f54896df500a92795089c85a4487c82fec5205835d1c57416254d4f416b4b4d7e8d3974c8ee26eedf97f8234cbeec34137855f2d28e28bba6bb3c1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}