{
  "manageEntity": {
    "action": "Save",
    "entityId": "254775521",
    "entityType": "Track",
    "nonce": "0x764480535c80cd36b494f459561a85c345d7bb1da1715b0fe155363652e7f1ef",
    "signature": "0xdf19d5f8ffba5f270d7996a36ec40f9afdddebe795e3fcd02da6ed3a2260ada726bd446ee8a0a493803945ace5181acc9f03f622934c510b381bd29ecdfbfc971b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}