{
  "manageEntity": {
    "action": "Save",
    "entityId": "475564683",
    "entityType": "Track",
    "nonce": "0xb7b553c69873bbe83300185ab323e732d785ac99000c7a7c04861870b9a4a5ae",
    "signature": "0x006846c20fdc754f4ea01e9d064104ce66810bf25701ba6677342489805839726dbfed8db504a1bbf55be8268d3a51015c67f7c96f2a6b640de376cdca7e85991b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}