{
  "manageEntity": {
    "action": "Save",
    "entityId": "1816542465",
    "entityType": "Track",
    "nonce": "0x887252cd41b3f73eb576fed6162ae3d4142e887079ffbd46463787aa5c0f0cba",
    "signature": "0x524668faac4a4e70bd2b1dd2bddafebc2705a8fe27a25748fd51e28dc23bed83137421fd0def4aa0a2d7a0f3eda7172cd00b4eafee7494109fdd088832ca2ef91c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}