{
  "manageEntity": {
    "action": "Save",
    "entityId": "519997761",
    "entityType": "Track",
    "nonce": "0xfda4d723c08cefcaa0597c52e7ad4cbe86674a2ddc1c48e0f8da10998bb1bdeb",
    "signature": "0xf5896cf2d4d85888573d558666c559a2bf5283a325ba60c4070ee0375431c67d15c54c5786995eaa31c4e5d59a98c21d3dd41c8c0cad38af141c45c846e074341b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}