{
  "manageEntity": {
    "action": "Save",
    "entityId": "388248864",
    "entityType": "Track",
    "nonce": "0x9689cdff19ebdcad2005ebc4eb0bd5e5c66a3e7e07753cbf87a92c2b4d27f505",
    "signature": "0xac4a63507b565b8ae698e37e86dd977875b1c29942a37432d24c03225f4213d06a4b74d373601bc1523a6a0c3e601880b2117bafc63aef75b5210cad3acab2481c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}