{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421027640",
    "entityType": "Track",
    "nonce": "0xfe32cba26c720913f3a3abc5c58e00dfbc508a33aefe176640849dced1d5ae8c",
    "signature": "0xef61d4c44834ecd338aeb4f666cc211a7a2f747adedfb06f9287d2aad0cf2c3766b763fb7332f2cfea5e30bae022ca3e1f0544142d759220155d8ea8b8e048ad1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}