{
  "manageEntity": {
    "action": "Save",
    "entityId": "751771",
    "entityType": "Track",
    "nonce": "0x76fcfeb4ff397c4dab9365619c14e12f02ddb5ed609aea08f236602bf2de6772",
    "signature": "0x96bf1c60cf37656ba56f374f25db71517006a4e55bac3e638ffecc514b8820af44314e70cbb611e6327ecd19b5d7412e1949f0f8bda649539941c332ae88bbf61c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}