{
  "manageEntity": {
    "action": "Save",
    "entityId": "456212",
    "entityType": "Track",
    "nonce": "0xd54c7bc242da02b9f3205a359d4b07b5a72a2591772b60a055ff0a937adf3a21",
    "signature": "0xd6a8f38cee507f4e072651f675879ce254c401ebb9c30e375e36b163b80fe4a9362ff631d454a6f169f5dd4461232fc5007e07eb6655aeb0e44ff070d62c1c621c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}