{
  "manageEntity": {
    "action": "Save",
    "entityId": "446419159",
    "entityType": "Track",
    "nonce": "0xfd37c4ac66cbd0fce6268476e54b278d04f6ffd3be323aecbd7948df614f46cc",
    "signature": "0xfa18314b34e56a9fd604848370397c2cf8b792f411087942ecd8208f81b945e53651e707e905b5b9e46c122e099f9a4da67df60b5b333c119c473842f96aed931b",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}