{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508116473",
    "entityType": "Track",
    "nonce": "0x7785e16209726eb8b71bec51a10bc80954b7f9d22641ef7ab2a1f1f662b334d3",
    "signature": "0xc11699ead13f82816977219a4b4a61c82a0b5597de55eddef11615799e9c616867123c14dcd67228956ae3d7b10ef4dc7c38303007727d60f2f21d3d602c66131b",
    "signer": "0xf954E35976C0aAaEC2968197F2a371Cc99E7C81A",
    "userId": "102143"
  }
}