{
  "manageEntity": {
    "action": "Save",
    "entityId": "639568501",
    "entityType": "Track",
    "nonce": "0xd353cf529fc892b29920ba43897c99579c91333c07ac3b61119f5f3340565c12",
    "signature": "0xe32abea0e06515cc1aae910befbd25a6673036a3b05efc384fbabe35f59ad65f5deb949b46a117fb352fa894d10f85568b6474cff5ca6f0c19de532f009f7d781c",
    "signer": "0x5F33Fedc0967cc575F9C03Aa567B3a28AC211014",
    "userId": "1044470"
  }
}