{
  "manageEntity": {
    "action": "Save",
    "entityId": "428372",
    "entityType": "Track",
    "nonce": "0x3a7243f6bc1064eb0d8ee3c3b7af9ffdaf1b3d349d6ee6bb5cd556caa54efc55",
    "signature": "0xaf0369037e145473754bad5a75a216dcc72c0c6ac4efc0be8f46244e0288e49d46bde13f334fb2158e1233233a5235cf0767d33bfc5ef41c4ad9ef5e9cd10d291b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}