{
  "manageEntity": {
    "action": "Save",
    "entityId": "303040",
    "entityType": "Track",
    "nonce": "0xd0fa703a67bec639fafa2207eb5b90e18ef13167b392ac25e68247fbf4fa3e1b",
    "signature": "0x28f16bc23cb0fbda88d15e0f90382b518ae15686ddf8123607b0acc5936b5d26756a0ec76dfa0a605787c894f17ddee37c19312b20d3770c47ce8f8f94be01241c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}