{
  "manageEntity": {
    "action": "Save",
    "entityId": "523001673",
    "entityType": "Track",
    "nonce": "0xf4f0b5c0860eb6ec43588bf48d1b00d2942a45e060241d2b5b6a0f0205c0fa77",
    "signature": "0xd91b1d7de9d92b945a8b9ddfbbf50370b76fa829bac8410ee6d509f6ad9fbbb84bb33def22754ae1763caf4cdb9d35b936fd49c561ae751986eef013268a869c1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}