{
  "manageEntity": {
    "action": "Save",
    "entityId": "697328974",
    "entityType": "Track",
    "nonce": "0xe6819f932f99ce8c2f9aaef74d6a8ec3175d88591fffa7f3e232060e03983a12",
    "signature": "0x4fde524ab47c23561c273f15e83d54026b90d22f407b074d48f199f763aa019e3f886e6514396fd342bec56fd608472e7026a8c6528bdcbd2ecae4e87169dfff1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}