{
  "manageEntity": {
    "action": "Save",
    "entityId": "544318",
    "entityType": "Track",
    "nonce": "0xcd8f5885e7c5d5411e56c9daf53bffeb10429e6230f971c116d082460ae99e3a",
    "signature": "0x783d857aeaf05cd69d0fc10b2848ca216b839e737ceeb0cec2f59d949309688b612b4bb71840721f31d84efecc001acea2136c4b0642fa24ae97e264b13b34dd1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}