{
  "manageEntity": {
    "action": "Save",
    "entityId": "57638851",
    "entityType": "Track",
    "nonce": "0xae65009cd75391df12a85e5c5e5a746b8cbd6123257bdc2b4baf4b0450ea518c",
    "signature": "0x55c1e115dd32673edbb64e44402b04e0be1252f6323256716020d9aa0cc127686bc6d8c0983cba000008e773738df714978f22abef3d875d8c33530766095e921b",
    "signer": "0x2F87bb373089af6C75e3362077A0E52A4779f72c",
    "userId": "582715056"
  }
}