{
  "manageEntity": {
    "action": "Save",
    "entityId": "462688940",
    "entityType": "Track",
    "nonce": "0xe4d15ad1e64c4c7dd0ed3bfb8194f132ce6a7ba20ebace45d756d228f62fc048",
    "signature": "0x39488bdf6235a530af22f90374c652f9d1cd5c23447446057c0c563c3ccf000e77164a0230ca514b10dfb47a57f1699bf5be503a539fd19c62a79ebd7dae537e1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}