{
  "manageEntity": {
    "action": "Save",
    "entityId": "418750994",
    "entityType": "Track",
    "nonce": "1789375043146610931",
    "signature": "0xe6032890c84540260129fe96ab81cac7c6ab492c5fbc9697b32a8c3766985a60458162dba10412439c91c74aff746a0c31d0547d396219661e84824bf89e24a11c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}