{
  "manageEntity": {
    "action": "Save",
    "entityId": "1446596547",
    "entityType": "Track",
    "nonce": "0xdee88184ab53aac415cbfae1a901eaee14a58a28e6355cbea75b7cdd474d167a",
    "signature": "0x353d87b6257abc12e3157de2af8da3bb62ecc9e04211d83e5cd10d3ab132db975f02f97470d440eadd95f4526d2aaa4525c1b4070725d6e442c69c35ec7b10db1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}