{
  "manageEntity": {
    "action": "Save",
    "entityId": "380584891",
    "entityType": "Track",
    "nonce": "0x13b8d4264390ce7967e09484887883e672ffbaca56eae8beced181ffcb00d6cf",
    "signature": "0xa7c9c8ed089d7e9761d6ebf4be91ede81d7fb16265d19d2889bef3197eb97210262b10b0333d96514f906b1466e3510111b848502d9003888cf2da81a7c9c32a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}