{
  "manageEntity": {
    "action": "Save",
    "entityId": "984602",
    "entityType": "Track",
    "nonce": "0x19ebc54393638d405987f1969ced0dad7c929aa40479291da82b9744fb96e05f",
    "signature": "0xeebaf63d886ef2cbbeef4155f498cfd25f08fbbd253564f6b5c9edca746dadd92cafb9def5f589828c70d7f58a8cd3cd1d3ab66a43acaf0d95bc8fe34500da491b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}