{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508175406",
    "entityType": "Track",
    "nonce": "0x3c07bf28475b0e75bfb37a7e6743a674a81ec9069e088a6e79321b4c677475e0",
    "signature": "0x4320662831ecd9a2cd3bcb3f3eddd8db7d57d8e23ad761271fe4fa7e6702bd1d3d75b66f9cb7dbb92434a83628b5c4919cf2890684f00ebc1309ce9c22bc857f1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}