{
  "manageEntity": {
    "action": "Save",
    "entityId": "323389781",
    "entityType": "Track",
    "nonce": "0xc4aecb028841ce4a92acee5ff17d97b9662fd2650a079958589e6373f20729a9",
    "signature": "0x1b64361ab853b8e1db37bfb6f60b4595a6a0c19d9443a08627e4e3368719b9c42ea98fe7da9e38c4a58b12908867ebdede05e1fdc0cc020e38e94bb50c78497a1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}