{
  "manageEntity": {
    "action": "Save",
    "entityId": "1446400767",
    "entityType": "Track",
    "nonce": "0xafe4c0f190936ddbb5497a7cf86fefce434cc713b0df43a815a06417ae1766e5",
    "signature": "0x57257495e7cf7efebbb4373cc18d179fcec0b7d0fac78ba4f5d8d16c76259d876655523e1de1093f3db1c940d025916d7c80181ba2f80453fe6be3432a27b7e31c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}