{
  "manageEntity": {
    "action": "Save",
    "entityId": "538729427",
    "entityType": "Track",
    "nonce": "0x019d9210e6bcd944603a7b05eeb932cc800c8adc03c41f5429ba1da99b81fb8d",
    "signature": "0xadb35deac0d231b2c75311c5417a7f8fbe4288000e9ab3113c86e3beb3c4f20450d7b455d0dacada8860fd75f81c6343abf52e24438988adb661229a3d363bfe1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}