{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904550646",
    "entityType": "Track",
    "nonce": "0x964ef83321991ad55a3c30550999602f1e809e5e997577bb14f450b542d14139",
    "signature": "0xf638bf54280db97de9462df4078b1b91f3c09817e0317b66da9bca6ac759e5ec4383ffa1ac7b1498531875eb98afacc1e4c1074afb438de2b56c893541b314701c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}