{
  "manageEntity": {
    "action": "Save",
    "entityId": "987048978",
    "entityType": "Track",
    "nonce": "0xc0dbb6595ac09d750a4a5526bfa5c14fcbf916cb50114fbbf00b2b95622c9436",
    "signature": "0x4b4bf2d523664686ed52a39f80a83ce1a3c3f45907377ab43d5d939ae4949b5e1a7b47aec2b5eb57b2c22ee052688967e30b629df54165542233842444d455721c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}