{
  "manageEntity": {
    "action": "Save",
    "entityId": "954454993",
    "entityType": "Track",
    "nonce": "1789965312312454375",
    "signature": "0x1c34f5d57439844db8339533194ee828e7dc9012dc10499937d585ff88ca3fb05e3fba59561b97f4b0458804a5380cee58fa85f52e871d15139e6bd6003af8661b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}