{
  "manageEntity": {
    "action": "Save",
    "entityId": "503418607",
    "entityType": "Track",
    "nonce": "0xb9c391e6610c84afe0a03505b745be0fd0b92d3d1b40f7079787d6d3d2afd78c",
    "signature": "0x1c4dcefda523eaf61cb96e6e3b978d254f98bacc99bb48128cca7b77d445636a4053bca3fac6a328a371a5766b436e5edc2653e0325a2a100b63eed3f44289e41b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}