{
  "manageEntity": {
    "action": "Save",
    "entityId": "892129529",
    "entityType": "Track",
    "nonce": "0xdd9da13922704e56decf7462d9055bd63c74b25e19508835dc49ea9bf1243889",
    "signature": "0x3f25086a717158964fa0dfce6607f61ac88e87affb0d19a2d102b90ce407ccbf3ee2dfe86b9cd67bff9475aa40a6b62b2a6d4aedc4b28ade79a31429765895c71b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}