{
  "manageEntity": {
    "action": "Save",
    "entityId": "701023777",
    "entityType": "Track",
    "nonce": "0x9b87572604524983c9ec5426f6c0dd0ce373ae0ed750d76eb3ebbb2e62b5f5d4",
    "signature": "0xccc0104ba9435900a668618bcb3a32720d4b68b5cdaf5ce2afe6cb573049a9a31d9bed7556e965dbd7fe430fe3650f2883981e29dc4aed3fcc16389d1298aafe1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}