{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990529197",
    "entityType": "Track",
    "nonce": "0x8a213a00be7f63b082a9c0dac388f946f63bb93c7ff0a6c3cd211499ffa6b6fd",
    "signature": "0xd4e9219c77d9d21e701c4d7b885162a8d54d4e1dd58479d187834442da95eb6e7e4b5242e1cdc8825886f67c0a4b8df24214c2c8d991f81f9cce3d1e0b6b96751c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}