{
  "manageEntity": {
    "action": "Save",
    "entityId": "406105874",
    "entityType": "Track",
    "nonce": "0xd0b1e875502bf41e21009f19e74533a6bce457d6b79c7503e0f654137545e1f6",
    "signature": "0x9a3133d9d5b1e48a5812dac99ec4642e37800cd3760b29c05ea03234480db33c1a16c085d06a9689401413c940a6a02caa451dff5e99310593c104f98b7582801b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}