{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896999759",
    "entityType": "Track",
    "nonce": "0xdba3aff5116a3eedf42156b293c5687aff7ca8ad8e1e39bd94f9d6bf5e6b969d",
    "signature": "0xc4bcedbafe2462798b8ed16361334f44a22069b31228b20696107578b78240724a293787157510727be80a4709339532ee2d3e9107c787523b01a5335949c0701c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}