{
  "manageEntity": {
    "action": "Save",
    "entityId": "138629842",
    "entityType": "Track",
    "nonce": "0x49320af0a7dae2242cbe9d6ca4caee1a24b89803afb394888e8a343dc9b70af4",
    "signature": "0xc5df4d7b74ffbd0370f91807656536c88bff67c8e1553400529bdda00e199ad73162712f6d729bd2852133803917f77000b906089244357bc8e57ca4d1d856fb1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}