{
  "manageEntity": {
    "action": "Save",
    "entityId": "703553425",
    "entityType": "Track",
    "nonce": "0xcbea31db6fdf3486988b22e8a24bfdfca46be7266c9252019ed1f1ec0df40860",
    "signature": "0x2e2e398824ef6ec7cc7224a8447f862ae11b1c20e5e71602c2029f73f1ff82d54404194c14229be434d2461fb5cebb3a9df8560becd90dcf54461e1e636a6c271c",
    "signer": "0x766d742Cc35188990Dc38CaD8006DEcEe3fAFed5",
    "userId": "353834"
  }
}