{
  "manageEntity": {
    "action": "Save",
    "entityId": "419625",
    "entityType": "Track",
    "nonce": "0xf1450187b3060938b41ab2e2b03cf3a601624e87037a6265bf05e0f29e121d65",
    "signature": "0xc6b667896e049e7cb1f617bf1c8f527a9bf30d41be347953d3cab6f322d30bf0203a200b4d8d1bec6fa72adff5725417375f13916f75d7a81060d181383fbba21c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}