{
  "manageEntity": {
    "action": "Save",
    "entityId": "122986008",
    "entityType": "Track",
    "nonce": "0x897fac39146d93ad40977b2aad8f71219a40467d0e21e3332b68ff22ef02239a",
    "signature": "0xd990d7fa20b58b4e23a84478c27f4d95e0eb261df6ad3b8203a869b0915d3a2a5e70476d2ad3e28b0d2c1b824d1d1b3595925fb7ad683301945b9ba0d1c8a14b1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}