{
  "manageEntity": {
    "action": "Save",
    "entityId": "696727",
    "entityType": "Track",
    "nonce": "0x3c4b08bce46b050f3d6a3464cb39b97dbdb35eb191de2fd579377c6658ee664a",
    "signature": "0x929ba62237cb244c0c92da47029eb2c96118cf26d99f32deb58a5b8f7a25433741303cf849e98accfc89135ee18e9fd920a36e5c31582e5a0f39c1ff7e2c97071b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}