{
  "manageEntity": {
    "action": "Save",
    "entityId": "954863",
    "entityType": "Track",
    "nonce": "0x518ffe5b9c107e0f6a49d41bdac6b722618d92378a413237681f9f3a8cd6d768",
    "signature": "0xf37b89b4841f2353ebc9914a4380751112bbe98ee9960c62bfe731751e4a7d95542fa13e39b3a3d88c492d57520d7fdcb28f3b97ff359b2188a86b707c2bfa881b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}