{
  "manageEntity": {
    "action": "Save",
    "entityId": "842989714",
    "entityType": "Track",
    "nonce": "0x8b770fc6d46e27e9008ee3c6b410bcbe7066adecb22a31d01951b097752a0822",
    "signature": "0x279fa9d66cc3e54be91e9b585ea33e925c705f037fe0fdac0401f7fa4c11c4065bd09f0b35d938bf38baa3b20c21a50e4d5a89cace3b8d847e6f30e6eb0f93091c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}