{
  "manageEntity": {
    "action": "Save",
    "entityId": "1372694487",
    "entityType": "Track",
    "nonce": "0xb6a4509319cb1f674946b310697bbc69941ddc80972df2ad0e4ae2f8f0372f52",
    "signature": "0x0f13812e00f1d7b10971c060b400bb9404d9116da9c5294e507ce4298a976f6a04ed043c50645e549a15ab110a2f7518391887f7609cdeb0bf4d033e2c6059931c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}