{
  "manageEntity": {
    "action": "Save",
    "entityId": "666461773",
    "entityType": "Track",
    "nonce": "0x322cd768a3cc62fa6457dad7aa2bd6e69fb2d6887aa98dd65f6e15f6a5dd2417",
    "signature": "0xba530947d2637dc15278c292501b5de1859f5d82cc206c7ea5eaea3bab4051193d7257e92cb987956fef2d868f3a5f8225b75a2fbc6819cf636b4140f28f9c4e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}