{
  "manageEntity": {
    "action": "Save",
    "entityId": "243573785",
    "entityType": "Track",
    "nonce": "0x43e83f8ac44d159e1d0a0145604daa90d61a1c4a91616a5917caf763720c2e0f",
    "signature": "0x699248f252a2d023c10ea7daacb3dc77d147e169f9c754d3f370b6a280364e0431db2fd68b73e49336ae6a8e2b7e455098e26536523f577f011ea694794b1b871b",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}