{
  "manageEntity": {
    "action": "Save",
    "entityId": "619065421",
    "entityType": "Track",
    "nonce": "0x8869307c4975a159283d979e9ab4e9b4f2c1c00e986823b969e25f981ad7b393",
    "signature": "0x44bf30fa9b90eef96a0262a24f2b2043d48820f8ca848f1b048d20dda8c042de2150758ef2af514f64364bc0bf76bd507780b2fe7ad73b0b793d2723e6acaf1a1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}