{
  "manageEntity": {
    "action": "Save",
    "entityId": "563479274",
    "entityType": "Track",
    "nonce": "1792391384235371565",
    "signature": "0x29c28526d3717b3bf9c218470a8eea2f0ef15b31dea0484009753b6016394d3132e878ab4e04f0e3972c431254eabf88ec2a029b6109fe9ea60b7fe6e02702281c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}