{
  "manageEntity": {
    "action": "Save",
    "entityId": "1749200751",
    "entityType": "Track",
    "nonce": "1790113013501031826",
    "signature": "0xc495abe0aa55f6a2e88e1e808bf6cefa37df750a657b954000144ecf72c9eacc6e2f952824e5da3dd9f6c462a48ee62507cda23527e51f1dee400c1e454e4c5e1c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}