{
  "manageEntity": {
    "action": "Save",
    "entityId": "681234",
    "entityType": "Track",
    "nonce": "0x9a9d383e85542c3dd8064e43ecbcbbfb3a680c5c3f91420b10e884ea7876b54e",
    "signature": "0x4ebffb48b4f90c08505a891c7eb10c3d90df8d6bd433dae7ba859ae109db27eb007e32b5dca22d9f018fc4758aa5a04a9a454a310b7e0212625d5d775063e58e1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}