{
  "manageEntity": {
    "action": "Save",
    "entityId": "484756",
    "entityType": "Track",
    "nonce": "0xe82908e94afb05b34c8c61b7ba6af3aa55e999ac523ea7ae0a20cdcaee6d51e4",
    "signature": "0x28050b5592989fef9c4ce03c8d1fbc793ef5adf9b1af01f2297dd7409bea361e765ef34f29e723987adab9fe639180f154aa1e2a61923cc4d2fe49250ea34bcc1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}