{
  "manageEntity": {
    "action": "Save",
    "entityId": "519026750",
    "entityType": "Track",
    "nonce": "0x9ae28cf86bf5af3d811afcfc1f5a888bca6f3192e239570015d2ebb7b085d43a",
    "signature": "0x5b09c773e97a9b58362f60f88fc711eab4e1df1990803dd09eb8ca307ad3772649cb5e19c5d452a659b716393be35fc972aab3df8de2d54d56b3271c431baf241b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}