{
  "manageEntity": {
    "action": "Save",
    "entityId": "668897505",
    "entityType": "Track",
    "nonce": "0x9a9eeaa7fe13ac85fda15a3584722998fd58036ecb592f5385ef3e32a7fee779",
    "signature": "0xa8bf96f6aea2242e7a17055dd7c0138db5d0d906173d6cf594bea10de1b98737595cab00b3d41d8eee78efaa910f640aa9fa074b68fe10aa849c407130b005051c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}