{
  "manageEntity": {
    "action": "Save",
    "entityId": "655781",
    "entityType": "Track",
    "nonce": "0x39a333cd504f8e72d5c179a6a9d870844464b6bb3c15c3e3331aec3ef49521f6",
    "signature": "0x85bd9abea92c81a0a25dbfa56bab769fa2d33362cf2e8f1905ec016f597201572df755ae364df3daf2d518b267cc2149f4582f4ae2ba25b5dfc08b702632bd6e1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}