{
  "manageEntity": {
    "action": "Save",
    "entityId": "655853825",
    "entityType": "Track",
    "nonce": "0x70a2d6af8f0dca99cc0c8f357ed5eba76873ba444fdc87f851df35fdc23a278c",
    "signature": "0x1734f219553de720a3dec2ffca35b555e92a3698e3fb301bd20a627b992bf2727c2157b2c6bf584171ba85277e435e92c905c5a23a3f301567062cb12028ba0f1c",
    "signer": "0xf954E35976C0aAaEC2968197F2a371Cc99E7C81A",
    "userId": "102143"
  }
}