{
  "manageEntity": {
    "action": "Save",
    "entityId": "609589477",
    "entityType": "Track",
    "nonce": "0xb4e211986a2b975765f7eb0402d5aec93a3a7d88bbe829c2878a6b75cc69814f",
    "signature": "0x7ebb601ff5b3b871831e74aa02d34332cabb331f1ec461d58c2fc5e46ad0a58677c59fe8c009cbf3c5ddbbee74639100cf888bc2fc4ed8a59b6602f3fc9eb8cd1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}