{
  "manageEntity": {
    "action": "Save",
    "entityId": "612972317",
    "entityType": "Track",
    "nonce": "0xde8e40aa6b7e3b8cc597f2f6f666c40181f7ded318c7dac9d3e75ecdeb3303ae",
    "signature": "0x1204d93d32942820944c5c1f12eff9c46140af2adec04c5109105bcca62f26606b63bb7bbb4cd5d25e260c2da82223cf596bd18fa297b9da050508a05bfd06a41c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}