{
  "manageEntity": {
    "action": "Save",
    "entityId": "576556781",
    "entityType": "Track",
    "nonce": "0xf2661684da2cf88c4c007a61ec4397d6711a62138aa5013d3bd32d860cc160aa",
    "signature": "0xfb87f5181c31154fc7ffad565479d62edf93c3f2dc37e1eeb4a0904771137ad8555e423d2659c7c3c03b1c2162920cbabc96404947b56ae09e0e72ba00aeaf681b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}