{
  "manageEntity": {
    "action": "Save",
    "entityId": "731349050",
    "entityType": "Track",
    "nonce": "0xd99c077050790b4bd2767c8aa3bbc45dd7938219c3d5605222647a4f547d38e3",
    "signature": "0x48b88439e1400c15db054f0b50785f2426f7681026497460425afc8f6548808c2bf3dd1d359bdcd782be6f32895dfbbf0671d409867a96de6fe594332dc64e291b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}