{
  "manageEntity": {
    "action": "Save",
    "entityId": "212896575",
    "entityType": "Track",
    "nonce": "0x6b1698481e7c7f6f4621456b0e72e26611379dc945b3289b3bb9e6cf0d7cd755",
    "signature": "0x1bf2aadd3f0f2275be96e3acfae274bb814ea15487d28620d0d54e1836f03ebe7239a2fe5d8aae0751770d865a0efe4ea224b3882ca228e3283bc0a407df90c51b",
    "signer": "0xAA981726F7939BF5eaAbfa9a58D0C454f5cB535D",
    "userId": "398277387"
  }
}