{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391390455",
    "entityType": "Track",
    "nonce": "0xd29835cd21878c6ae16458e2f4275f269ac8949dd2ae41a7cf04b41f81b49fb6",
    "signature": "0x8d52be1ea883be05c70ca3cd6e2482e42dee710d1ca3ced0ed9e4be23058c0d43f79e53ca98dc7d48212460e431ea8bd7fabede23fe5a8edc32401916e4031eb1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}