{
  "manageEntity": {
    "action": "Save",
    "entityId": "1299495175",
    "entityType": "Track",
    "nonce": "0xaa5548276c23740c5494f9762b406c7be04ac384ea69f6bcdc5bcc6bce49f28c",
    "signature": "0x31d04d8fce4b5940f481d60e13094ce9216a5bb9ec5513f7ee50a5861985676b38e66b25c8340aff903569f229694aa0ba984b915bc0d8fef3e6835a802ae5441c",
    "signer": "0xC7B16Eee24C03712c67aa884907593f4df23db87",
    "userId": "56534466"
  }
}