{
  "manageEntity": {
    "action": "Save",
    "entityId": "140948436",
    "entityType": "Track",
    "nonce": "0x35b1bc76b261576f68fd877899acbd9496de08af22328b23dbbc2b4174fa37cc",
    "signature": "0xaada52f0ea12779b7cb0984df0973a2d93fd96b034aaa727d1b5e74649ec0869783b1ec2d6e8012527566acad36e0c309d5fc91773cba4535579d3088f00a1191c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}