{
  "manageEntity": {
    "action": "Save",
    "entityId": "150455846",
    "entityType": "Track",
    "nonce": "0x812c4b111d880c5d428984dbab367773adf611dc2d9f0dad8dae01421b44ee5a",
    "signature": "0xd6d452503367719e75b8a8106a5af0f9e0dec67d3196ca10bdb5beb88ce5ae753c607c876ed141bd39b178e0d2a39dec725de9538bbcbbaef483f7f492cf1dba1c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}