{
  "manageEntity": {
    "action": "Save",
    "entityId": "974898283",
    "entityType": "Track",
    "nonce": "0xc105a6222a113be2540edd2ce403e89cd8eb78cab8af6bf7c6596491f8237330",
    "signature": "0x2727271fd5b8182160414cae4550d3eef9048ec0b429ea687538f0a1d06cd9242cba4efc70cec965b4faf84aee9ccdccff7aa352c941bc8ed35f35f23954da861c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}