{
  "manageEntity": {
    "action": "Save",
    "entityId": "1628008247",
    "entityType": "Track",
    "nonce": "0x88241b661a3e1fa0e646c746db673938ae58d049cc76615a4d49aad973e3bf21",
    "signature": "0x3ece454b32fe7c4192e4b4b8b15a98c43c5156be50cbcd880dc511e9af2754672bccd9fe653fda52615bc2d9c6e5c87f17d45054d1052809b6e888db343b0fcf1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}