{
  "manageEntity": {
    "action": "Save",
    "entityId": "231053869",
    "entityType": "Track",
    "nonce": "0xcc399843e7e336d731e74343a1d4dce64c567a2a60ab6a1bca7f6e4857ea2d7d",
    "signature": "0xf439638c8a4ab8ea4afc1f56682ea4e658b9207624bb68f21df2a19c5f3f8aa0332945861abba0f6eb57449fe8ce85f839bf1c1bfcc3f98f4ed77c8339fbb4881c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}