{
  "manageEntity": {
    "action": "Save",
    "entityId": "543621",
    "entityType": "Track",
    "nonce": "0x7556edef6dee91f9f16e832e049ff81bdab695883ddc5750e05b3e4153a76884",
    "signature": "0xd4a3420925731969404c2d80b4d944df944533d033cf6977bad4a40a5fcb5fdf77bc70c47ff2298e499b58d971315913fbb2c213c81901d088440f0f764574a71b",
    "signer": "0x55B320FE4ae0dC96fE927A1d4fA23b18d1874EF1",
    "userId": "562822143"
  }
}